Presentation Information
[25a-P01-24]Frequency-independent signals at low magnetic fields in large-current spin-torque ferromagnetic resonance measurement
〇Toshiyuki Kodama1, Nobuaki Kikuchi1, Tomohiro Taniguchi2, Yuki Hibino2, Shingo Tamaru2, Satoshi Okamoto1, Seigo Ohno1, Satoshi Tomita1 (1.Tohoku Univ., 2.AIST)
Keywords:
spin torque ferromangetic resonance,spin-Hall effect,permalloy/plutinum bilayer
Low field signals in the spin-torque ferromagnetic resonance (ST-FMR) measurement are attractive because the signals are caused by unidirectional spin-Hall magnetoresistance and in-plane magnetization reversal. The present study reports a new low field signal in ST-FMR measurements of a permalloy/platinum bilayer with various dc bias currents. Besides the FMR signal of the permalloy, a signal at low magnetic fields is observed. The signal intensity is dependent on the bias current value, but independent of the ac current frequency.