Enhancement of sensitivity in high-frequency radio-wave magnetic detectors by using current-induced torque acting as magnetic field

2014 Fiscal Year Final Research Report

• Project/Area Number: 25790045
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: MATSUMOTO Rie 独立行政法人産業技術総合研究所, スピントロニクス研究センター, 研究員 (10635303)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: スピントロニクス / スピントルク / ダイオード / 磁気共鳴

Outline of Final Research Achievements

We proposed a method to enhance spin-torque diode (STD) sensitivity by using an antiphase dynamic coupling (ADC) of the free and reference layers. The ADC was found in STD measurements of MgO-based magnetic tunnel junctions and also in micromagnetic simulations. In order to investigate the optimal conditions for the ADC, we developed an analytical expression for the STD effect caused by the magnetization dynamics in the reference layers. From the analytical expressions, we found that inducing interaction between the reference and magnetic-pinned layers through the spin torque is more advantageous to the ADC than inducing interaction between the reference and free layers. The analytical expression also made it possible to evaluate quantitatively the spin-torque interactions working on the reference layer.

Free Research Field

スピントロニクス