The 206th Special MMU seminar   


Resonance readout of magnetization direction using a spin-torque oscillator and its application to three-dimensional magnetic recording

Dr. H. Suto
Corporate Research & Development Center, Toshiba Corporation, Kawasaki, Japan.

Date & Time: 15:00 - 16:00, June 24th (Wed), 2015.
Place: 7F Small Seminar Room, Sengen

Abstract:

  We experimentally demonstrate a method for detecting the magnetization direction of a nanoscale magnet using a spin-torque oscillator (STO). The distinctive feature of this resonance readout is that it can selectively detect the magnetization direction of a specific magnet even when there are several other magnets nearby, which originates from the novel principles based on dynamical dipolar coupling between an STO and a magnet. By tuning the STO oscillation frequency to match the ferromagnetic resonance (FMR) frequency of a target magnet, coupling between the STO and magnet occurs. Because the coupling affects the STO oscillation, the magnetization direction of the magnet is detected by analyzing the STO oscillation. The resonance readout is considered suitable for a readout method in three-dimensional magnetic recording. Three-dimensional recording uses multilayer recording medium to multiply the recording density and therefore requires a layer-selective readout method.

  This work is supported by Strategic Promotion of Innovative Research and Development from Japan Science and Technology Agency, JST.