News


Materials Research Bulletin Highlights Strain Mediated Magnetoelectric Work, "Turning Science Fiction Into Reality"

posted Nov 9, 2018, 8:45 AM by Michelle Schwartz Servan   [ updated Nov 9, 2018, 1:41 PM ]

The November 2018 issue of Materials Research Bulletin journal will feature five articles written by distinguished researchers, organized by Professor Gregory Carman and Professor Nian Sun. The articles discuss the control of magnetism and are designed to encourage more research on magnetoelectrics, highlighting the potential of this research to impact society by efficiently controlling magnetism in the small scale. 

The lead article, entitled Turning Science Fiction into  Reality Using Strain Mediated Magnetoelectrics, describes the motivation for focusing on this important area of research by providing background information, research opportunities and application descriptions in this arena. The article also highlights the scientific push the TANMS center has been making since its inception in 2012.

Advances from Salahuddin Group on Detecting Magnetic Fields with Diamond Dust Generates Buzz in the Research Community

posted Oct 17, 2018, 4:17 PM by Tsai-Tsai O-Lee   [ updated Oct 17, 2018, 4:19 PM ]

Image credit: https://www.chemicalnews.org/magnetic-field-detected-economically-by-diamond-dust/

Research led by Professor Sayeef Salahuddin's group at UC Berkeley is set to revolutionize science and industry with a magnetic sensor that reduces the energy required to power magnetic field detectors.  Their findings was recently published in Science Advances (Vol. 4, no. 9).  

Congratulations to the Salahuddin Group on this exciting breakthrough!



ABSTRACT
Magnetic sensing technology has found widespread application in a diverse set of industries including transportation, medicine, and resource exploration. These uses often require highly sensitive instruments to measure the extremely small magnetic fields involved, relying on difficult-to-integrate superconducting quantum interference devices and spin-exchange relaxation-free magnetometers. A potential alternative, nitrogen-vacancy (NV) centers in diamond, has shown great potential as a high-sensitivity and high-resolution magnetic sensor capable of operating in an unshielded, room-temperature environment. Transitioning NV center–based sensors into practical devices, however, is impeded by the need for high-power radio frequency (RF) excitation to manipulate them. We report an advance that combines two different physical phenomena to enable a highly efficient excitation of the NV centers: magnetoelastic drive of ferromagnetic resonance and NV-magnon coupling. Our work demonstrates a new pathway that combine acoustics and magnonics that enables highly energy-efficient and local excitation of NV centers without the need for any external RF excitation and, thus, could lead to completely integrated, on-chip, atomic sensors.

Full article: http://advances.sciencemag.org/content/4/9/eaat6574
Berkeley News: http://news.berkeley.edu/2018/09/10/diamond-dust-enables-low-cost-high-efficiency-magnetic-field-detection/

Research from TANMS 3D Team Featured on Advances in Engineering

posted Aug 30, 2018, 10:44 AM by Tsai-Tsai O-Lee   [ updated Aug 30, 2018, 10:44 AM ]

Research recently published by Dr. Roberto Lo Conte, postdoctoral researcher under Professor Jeffrey Bokor at the UC Berkeley Department of Electrical Engineering and Computer Science was featured online by Advances in Engineering (AIE).  The paper published in Nano Letters titled "Influence of Nonuniform Micron-Scale Strain Distributions on the Electrical Reorientation of Magnetic Microstructures in a Composite Multiferroic Heterostructure" was identified by AIE selection committee as a key scientific article contributing to excellence in science and engineering research.

The research by Dr. Lo Conte and the TANMS 3D Thrust demonstrated a systematic micron-scale study of the physical mechanisms which drive a PMN-PT/Ni multiferroic actuator.  Findings as such contribute to a promising path toward the development of ultralow power magnetoelectric devices.

Abstract
Composite multiferroic systems, consisting of a piezoelectric substrate coupled with a ferromagnetic thin film, are of great interest from a technological point of view because they offer a path toward the development of ultralow power magnetoelectric devices. The key aspect of those systems is the possibility to control magnetization via an electric field, relying on the magneto-elastic coupling at the interface between the piezoelectric and the ferromagnetic components. Accordingly, a direct measurement of both the electrically induced magnetic behavior and of the piezo-strain driving such behavior is crucial for better understanding and further developing these materials systems. In this work, we measure and characterize the micron-scale strain and magnetic response, as a function of an applied electric field, in a composite multiferroic system composed of 1 and 2 μm squares of Ni fabricated on a prepoled [Pb(Mg1/3Nb2/3)O3]0.69–[PbTiO3]0.31 (PMN–PT) single crystal substrate by X-ray microdiffraction and X-ray photoemission electron microscopy, respectively. These two complementary measurements of the same area on the sample indicate the presence of a nonuniform strain which strongly influences the reorientation of the magnetic state within identical Ni microstructures along the surface of the sample. Micromagnetic simulations confirm these experimental observations. This study emphasizes the critical importance of surface and interface engineering on the micron-scale in composite multiferroic structures and introduces a robust method to characterize future devices on these length scales.

About the Author
Dr. Roberto Lo Conte has been important member of the TANMS 3D Thrust.  His scientific interests focus on studying new magnetic materials systems useful for the development of energy efficient spintronic devices. He began is academic career in Italy, obtaining his bachelor degree and subsequently his master degree in Physics Engineering at the Politecnico di Milano, with a final project focused on the fabrication and characterization of a magneto-optic device for the development of a metallic spin-flip based laser. Such a project was carried out at the Royal Institute of Technology (KTH) in Stockholm, Sweden, where Dr. Lo Conte spent two years as a Double Degree student and obtained his Master of Science in Engineering degree. In 2012 he moved to Germany for his PhD in Applied Physics at the Johannes Gutenberg University of Mainz, where he graduated in 2015 with a thesis on “Magnetic nanostructures with structural inversion asymmetry”.

In 2016 he joined the University of California at Berkeley as a post-doctoral researcher in the Electrical Engineering and Computer Science department, where he investigated multiferroic heterostructures with the intent of developing new magnetoelectric technologies for energy efficient applications.

Today Dr Lo Conte is a Marie Curie Fellow at the University of Hamburg in Germany and a post-doctoral research associate at the University of California at Berkeley, in the Materials Science and Engineering department, studying magnetic multilayers hosting topologically non-trivial spin states.

SOURCES:
Advances in Engineering: https://advanceseng.com/strain-distributions-magnetoelectric-multiferroic-devices-revealed/
Nano Letters: https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b05342

TANMS Graduate Student Awarded the 2018-19 ALS Doctoral Fellowship in Residence

posted Jul 31, 2018, 5:42 PM by Michelle Schwartz Servan   [ updated Jul 31, 2018, 6:14 PM by Tsai-Tsai O-Lee ]

TANMS graduate student, Zhuyun "Maggie" Xiao, has been named a recipient of the highly coveted Advanced Light Source (ALS) Doctoral Fellowship in Residence for 2018-19. This internationally recognized fellowship is awarded to only 8-10 students each year. During her fellowship year, Maggie will be working at the ALS, a division of Lawrence Berkeley National Laboratory (LBNL). LBNL is a national user facility that generates intense x-ray radiation for scientific and technological research. Students acquire hands-on scientific training and develop professional maturity to complement their doctoral research. Maggie will be hosted by Dr. Elke Arenholz, Senior Scientist and Deputy of Photon Science Operations and will continue to work on TANMS-related research. 

Maggie is a Ph.D. student under TANMS 3D Thrust Leader and Associate Professor Robert N. Candler in the UCLA Department of Electrical and Computer Engineering. She holds a bachelors of science in Physics from Bryn Mawr College and was recently recognized with the 2017-2018 Distinguished Master's Thesis Award from UCLA Department of Electrical and Computer Engineering.  Her thesis titled "Controlling Magnetization and Strain at the Micron-Scale and Below in Strain-Mediated Composite Multiferroic Devices" focuses on the goal of realizing electrically-controlled, miniaturized magnetoelectric composite devices that are energy-efficient, and compact, for applications such as localized particle and cell manipulation and cell therapy.  Maggie is a valued member of the TANMS 3D Thrust.  

TANMS Doctoral Student Wins Best Paper Award at IEEE International Frequency Control Symposium

posted May 31, 2018, 12:24 PM by Michelle Schwartz Servan

TANMS doctoral student, Sidhant Tiwari, has received the Best Student Paper Award in the Sensor and Transducers group at the 2018 IEEE International Frequency Control Symposium held in Olympic Valley, CA. His presented work, "Frequency Doubling in Wirelessly Actuated Multiferroic MEMS Cantilevers" demonstrates how nonlinear multiferroic coupling can be used to measure multiferroic antennas without noise, the first ever demonstration of this technique. 

Sidhant is a fifth year Ph.D. candidate and a member of the Sensor and Technology Laboratory, working under Professor Robert Candler. His research focuses on studying the dynamics of multiferroic coupling and applying it to the design of a high efficiency chip-scale radio frequency devices, such as antennas. 

TANMS Graduate Student Received Distinguished Master's Thesis Award for Research Work at TANMS

posted May 29, 2018, 9:15 AM by Michelle Schwartz Servan   [ updated May 29, 2018, 9:19 AM ]

TANMS graduate student, Zhuyun Xiao, has been awarded the 2017-2018 Distinguished Master's Thesis Award in Physical & Wave Electronics of the UCLA Department of Electrical and Computer Engineering. Her thesis, titled "Controlling Magnetization and Strain at the Micron-Scale and Below in Strai
n-Mediated Composite Multiferroic Devices," focuses on the TANMS 3D thrust's goal of realizing electrically-controlled, miniaturized magnetoelectric composite devices that are energy-efficient and compact for applications such as localized particle and cell sorting. The collaborative research work was carried out by a team of researchers from TANMS (including those from UCLA, UCB and Cornell University) and scientists at Advanced Light Source, Lawrence Berkeley National Lab in Berkeley. 
Zhuyun received her master's degree in Electrical Engineering from UCLA in 2017 and her bachelor's degree in Physics from Bryn Mawr College in 2015. She is currently a third year Ph.D. student in the Sensors and Technology Laboratory, advised by Professor Rob N. Candler in the UCLA Department of Electrical and Computer Engineering.

TANMS Graduate Student Wins Best Poster Award at the 2018 IEEE International Magnetics Conference in Singapore

posted May 2, 2018, 4:44 PM by Michelle Schwartz Servan   [ updated May 2, 2018, 4:48 PM ]

TANMS is proud to recognize TANMS Graduate Student, Qianchang Wang, for winning Best Poster Award at the 2018 IEEE International Magnetics Conference in Signapore. Qianchang is a fourth year Ph.D. candidate under Professor Gregory Carman in the UCLA Department of Mechanical and Aerospace Engineering. Her research focuses on modeling multiferroic systems coupled with spin-orbit torque using finite element method, with applications in magnetic memory and logic.  This work numerically demonstrates the ultra energy efficiency of multiferroic control of a nanoscale magnetic memory bit. The energy consumption is as low as 22 aJ per flip for a Terfenol-D disk, which is 3-4 orders more energy efficient than current-based control mechanisms. 


[The following is the title/abstract of the paper that was presented at the 2018 Intermag Conference]

Voltage Induced Strain-mediated Perpendicular Magnetization Control for In-memory Computing Device

ABSTRACT: Magnetic memory has attracted substantial attention due to its promise of high energy efficiency combined with non-volatility. Conventionally, the magnetization is controlled by spin-transfer torque (STT) current but ohmic heating makes the current-based switching mechanisms energy inefficient (100fJ/flip). In contrast, strain-mediated multiferroic composites (i.e. coupled magnetoelastic and piezoelectric thin films) provide ultra-high energy efficiency as high as 100aJ/flip due to negligible induced current during the switching process.  In this study, a fully coupled model is used to simulate strain-mediated magnetization control of nanodots with perpendicular magnetic anisotropy (PMA) on a PZT (Pby[ZrxTi1-x]O3) thin film. This model is also used to study Bennet clocking of nanodot arrays.

TANMS Takes Second Place at the National Perfect Pitch Competition

posted Nov 7, 2017, 2:35 PM by Tsai-Tsai O-Lee   [ updated Nov 7, 2017, 2:35 PM ]


TANMS is proud to announce that Stephen Sasaki, doctoral student from UCLA Chemistry and Biochemistry department has placed second in the 2017 National NSF ERC Perfect Pitch Competition with his pitch titled "Wireless Lab on a Microchip: A Continuous Clinical Grade Health Monitoring Implant".  

Stephen is the current TANMS SLC President and participates on the Materials Thrust under the guidance of faculty adviser Professor Sarah Tolbert.  

Congratulations, Stephen!

TANMS 2017 Perfect Pitch Competition

posted Sep 26, 2017, 4:39 PM by Michelle Schwartz Servan   [ updated Sep 29, 2017, 11:08 AM ]

Our TANMS Perfect Pitch competition was fantastic!

A big thank you to all of the students who participated and effectively articulated their respective pitches both in person and online. It was refreshing to see and hear 15 pitches addressing a mix of application areas using TANMS technology. 

Congratulations to the winners!

1st place: "Wireless Lab on a Microchip: A Continuous Clinical Grade Health Monitoring Implant" by Stephen Sasaki, UCLA Department of Chemistry and Biochemistry
2nd place:  "Revolutionary Nanoscale Motor for use in Drug Delivery Vehicle" by Auni Kundu, UCLA Mechanical and Aerospace Engineering
3rd place:"Micro-RFID for Grocery Stores" by Ty Karaba, UCLA Department of Chemistry and Biochemistry

(Pictured - Stephen Sasaki & Tom Normand, TANMS Industry Liaison Officer)

Also, a big thank you to our judges as well! We appreciated their time and constructive comments:
  • Schaffer Grimm - Business Strategist, Institute for Technology Advancement 
  • Audrey Pool O'Neal -  Director, Women in Engineering 
  • Bill Goodin - Industry Relations Coordinator, Electrical Engineering 
  • David Blancha - Assistant Director, Graduate Student Career Services
  • Jane Chang -  Professor, Chemical and Biomolecular Engineering
  • Pilar O'Cadiz - Education Director, TANMS Engineering Research Center

We are looking forward to the national competition on November 1st in Washington, DC at the ERC Biennial Meeting.








2017 TANMS Young Scholars Program Culminates with the Dedication of the Elijah S. Robinson Award

posted Aug 11, 2017, 10:31 AM by Tsai-Tsai O-Lee





For the second year in running, high school teacher and RET program participant, Eric Mattsson, brings to UCLA a team of six high school students from Westchester Enriched Sciences Magnet to participate in the TANMS Young Scholars Program (YSP).  Team members Sydney Balkcom, Corey Kizzee, Jai Lewis, Thailiya Thomas, Robert Nwoye, and Naim Wright worked under the guidance of graduate student mentor, Andres Chavez, in Professor Gregory Carman's lab on the research project titled "Effect of Strain on Ferromagnetic Resonance in Ni Elements".  Aside from research, the young scholars learned about college life during a discussion panel with undergraduate researchers participating in the TANMS REU program, explored electromagnetism through the hands-on TANMS Science Modules, and attended a field trip to Los Angeles Exhibition Park, California African American Museum and the California Science Center.  The Young Scholars Program culminated with the students providing a team oral presentation on their research project and participated in a "Perfect Pitch" competition designed by Mr. Mattsson where teams presented their ideas on how to resolve negative environmental impacts of pesticides by using TANMS multiferroic technology.

The YSP Culmination ended with a very special presentation of the first Elijah S. Robinson Award for Inspiration, Integrity and Scholarly Promise in Engineering to rising junior, Naim Wright.  Naim has a strong interest in STEM and has goals for the medical field.  His collaborative disposition, academic diligence and competency is exemplary for what this award recognizes. 

 

About Elijah S. Robinson



Elijah S. Robinson joined the TANMS family one year ago as part of the 2016 Young Scholars Program. He worked under the mentorship of graduate student, Xiang Li, in Professor Kang Wang’s group at UCLA Department of Electrical Engineering.  He was a rising senior from Susan Miller Dorsey Senior High School at the time of his participation and was set to attend California State University, Dominguez Hills, this coming fall, majoring in Computer Engineering.  Sadly, on June 27, 2017, Elijah's life was lost tragically.  

Elijah's spirit epitomizes the TANMS principles and is best expressed by his own words: “Because I understand how important technology is to this world […] I have a big plan for myself and will pursue it and give it my all. I’m fully aware of the hard work it will take and I know it’s all worth it in the long run. […] I'm driven to become a software engineer and take advantage of all opportunities that are available to me. Opportunities like TANMS YSP is what I'm searching for and I will love to be a part of it and grow as a STEAM prodigy.” 

Elijah exemplified TANMS' values and vision in his generosity and compassion for others, and in his resilience and persistence in the pursuit of higher education and engineering career goals.  In his memory, TANMS dedicates the Elijah S. Robinson Award for Inspiration, Integrity and Scholarly Promise in Engineering

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