2020/10/09 by Motomi Aoki, Ei Shigematsu, Masayuki Matsushima +5
Engineering · Physics and Astronomy · #Advanced Memory and Neural Computing #Condensed matter physics #Ferromagnetic resonance #Ferromagnetism #Magnetic field #Magnetic properties of thin films #Magnetization #Materials science #Permalloy #Physics #Quantum and electron transport phenomena #Rectification #Spin (aerodynamics) #Voltage #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.102.174442
arxiv created 2020/10/09 · openalex created_date 2020/10/15 · openalex publication_date 2020/11/30 · arxiv updated 2020/12/30 · openalex updated_date 2026/08/05
In-plane magnetization reversal of a permalloy/platinum bilayer was detected using the spin rectification effect. Using a subgigahertz microwave frequency to excite spin-torque ferromagnetic resonance (ST-FMR) in the bilayer induces two discrete DC voltages around an external static magnetic field of 0 mT. These discrete voltages depend on the magnetization directions of the permalloy and enable detection of the in-plane magnetization reversal. The threshold current density for the magnetization reversal is around 10--20\phantom\rule0.16em0exMA/cm2, the same order as for known spin-orbit torque switching with in-plane magnetization materials. The magnitude of the signal is the same or larger than that of the typical ST-FMR signal; that is, detection of magnetization switching is highly sensitive in spite of deviation from the optimal ST-FMR condition. The proposed method is applicable to a simple device structure even for a small ferromagnetic electrode with a width of 100 nm.