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Sensitivity enhancement in magnetic sensor using CoFeB/Y3Fe5O12 resonator.
Md Shamim Sarker1,2, Hiroyasu Yamahara3, Lihao Yao1
1Department of Electrical Engineering and Information Systems, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Scientific Reports
|June 30, 2022
Summary
Researchers developed an ultra-low power magnetic sensor using a CoFeB/Y3Fe5O12 bilayer. This magnonics device achieves high sensitivity for detecting magnetic field variations, paving the way for post-CMOS technologies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Magnonics utilizes spin waves as data carriers for ultra-low power applications, crucial for post-CMOS technology.
- Spin wave manipulation enables versatile sensing capabilities across various physical fields.
- Developing highly sensitive and low-power magnetic sensors is a key research objective.
Purpose of the Study:
- To design and demonstrate a highly sensitive, simple, and ultra-low power magnetic sensor.
- To investigate the potential of a CoFeB/Y3Fe5O12 bilayer structure for magnetic sensing.
- To explore theoretical enhancements for achieving nanoscale magnetic field sensitivity.
Main Methods:
- Fabrication of a CoFeB/Y3Fe5O12 bilayer structure.
- Characterization of spin-wave transmission spectra to identify a sharp rejection band.
- Experimental measurement of frequency shifts in response to external magnetic fields.
- Theoretical investigation of a Y-shaped spin wave interference device.
Main Results:
- The CoFeB/Y3Fe5O12 bilayer exhibited a sharp rejection band in its spin-wave transmission spectra.
- Experimental sensitivity of 10⁻² mT was achieved, with higher sensitivity in the order of 10⁻⁶ T (µT) demonstrated.
- Theoretical analysis predicted nanoscale sensitivity (nT range) for a Y-shaped interference device at room temperature.
Conclusions:
- The CoFeB/Y3Fe5O12 bilayer structure is a promising platform for developing ultra-low power, highly sensitive magnetic sensors.
- The sensor's sensitivity can be tuned by adjusting structural parameters, such as the width of the CoFeB metal stripe.
- This research contributes to the advancement of magnonic devices for future electronic applications.
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