News


TANMS Graduate Student Receives Best Student Presentation Award at 2019 Joint MMM-Intermag Conference

posted Feb 13, 2019, 8:45 AM by Michelle Schwartz Servan   [ updated Feb 13, 2019, 9:10 AM ]

Zhuyun (Maggie) Xiao of Professor Rob Candler’s research group was recently awarded the Best Student Presentation Award at the 2019 Joint MMM-Intermag Conference.  The conference includes a wide range of topic on magnetism and magnetic materials, and has historically drawn more than 1800 conference registrants, of which more than 500 are students.  The pool of student presenters was narrowed to five finalists, and from this group Maggie’s work on single domain magnetism for particle and cell manipulation was chosen for the Best Student Presentation Award.  Congratulations Maggie!


New Start-up Co-founded by TANMS Alum Joins TANMS IAB

posted Jan 18, 2019, 11:28 AM by Tsai-Tsai O-Lee   [ updated Jan 18, 2019, 11:29 AM ]

TANMS welcomes Sonera Magnetics Inc. as the newest member of our Industrial Advisory Board.  Co-founded by TANMS alumnus, Dr. Dominic Labanowski, former graduate student in the Salahuddin Group at UC Berkeley, Sonera Magnetics is developing a magnetometer that can operate at room temperature and in portable form factors with sensitivity comparable to the best magnetic sensors available today.  The core technology of Sonera Magnetics is a magnetic sensor based off of results from Dr. Labanowski's graduate studies at UC Berkeley on acoustically-driven ferromagnetic resonance.  This sensor leverages the strong interaction between GHz-frequency sound waves and magnetic thin films where the coupling enables a device with comparable performance to SQUID and SERF magnetometers, but has the capability to operate in ambient environmental conditions.  

Source: Cyclotron Road http://www.cyclotronroad.org/sonera (May 2018)

YouTube Video


TANMS Education Director Joins Advisory Committee for UNESCO Chair

posted Jan 18, 2019, 10:42 AM by Tsai-Tsai O-Lee   [ updated Jan 18, 2019, 12:43 PM ]

TANMS Education Director, Dr. Pilar O'Cadiz, has been selected to join the Advisory Committee for the United Nations Educational, Scientific and Cultural Organization (UNESCO) Chair in Global Learning and Global Citizenship Education.  Global Citizenship Education (GCE) is a strategic area of UNESCO’s Education Sector program that aims to instill in learners the values, attitudes and behaviors that support responsible global citizenship: creativity, innovation, and commitment to peace, human rights and sustainable development. The Advisory Committee serves the inaugural UNESCO Chair for GCE, UCLA Distinguished Professor of Education Carlos Alberto Torres, in "[promoting] an integrated system of research, training, information and documentation on global learning and global citizenship education and foster excellence and innovation in research and practice." (https://bostonglobalforum.org/2016/02/ucla-establishes-new-unesco-chair-in-global-learning-and-global-citizenship-education/

TANMS is honored to have Dr. O'Cadiz as part of our team.

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.

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