Title :
Magnetization dynamics in spin-torque oscillator with negative Ku for microwave assisted magnetic recording
Author :
Tiejun Zhou ; Mingsheng Zhang ; Hong Jing Chung ; Hon Seng Wong ; Shikun He ; Boon Hao Low ; Zhejie Liu ; Tjiptoharsonos, Febiana
Author_Institution :
Data Storage Inst., A*STAR (Agency for Sci., Technol. & Res.), Singapore, Singapore
Abstract :
The paper discusses the magnetization dynamics of spin-torque oscillator with negative Ku under alternative head field for microwave assisted magnetic recording. Magnetization switching of spin-injection layer (SIL) is essential to have the same precession mode of the field generation layer before and after the head field change directions. The SIL needs to be properly chosen in order to have short switching time. The layer stack and material selection of spin torque oscillator (STO) is also discussed in terms of stability against the stray field. The results discussed in this paper helps to understand the design fundamentals of STO for microwave assisted magnetic recording.
Keywords :
magnetic recording; magnetisation; oscillators; spin valves; stability; field generation layer; magnetization dynamics; magnetization switching; microwave assisted magnetic recording; spin-injection layer; spin-torque oscillator; Magnetic fields; Magnetic heads; Magnetic recording; Magnetization; Materials; Spin polarized transport; Switches; MAMR spin torque oscillator; negative anisotropy energy; spin injection;
Conference_Titel :
Magnetics Symposium 2014 - Celebrating 50th Anniversary of IEEE Magnetics Society (MSSC50)
Conference_Location :
Singapore
DOI :
10.1109/MSSC.2014.6947943