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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 ]
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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!

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.

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