Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction between Write Head and STO and Optimum Injected Current

Yasushi Kanai, Takuto Katayama, Kazuetsu Yoshida, Simon Greaves, Hiroaki Muraoka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording (MAMR). To realize MAMR, a small injected STO current is mandatory, as are large amplitude and stable oscillations. In this paper, an isolated STO element (without the write head) and an STO integrated into a write head were analyzed using micromagnetic analysis. First, the integrated STO was used and the optimum injected currents ( Jopts ) that excite high-frequency magnetic fields were derived for various Gilbert damping factors (αs) and saturation magnetization (4πMs) in the field generating layer. Second, Jopts were derived for various isolated STO structures. The effect of the material characteristics on Jopt was also investigated.

Original languageEnglish
Article number7353178
JournalIEEE Transactions on Magnetics
Volume52
Issue number7
DOIs
Publication statusPublished - 2016 Jul

Keywords

  • Micromagnetic simulation
  • Spin-Torque oscillator
  • microwave-assisted magnetic recording
  • spin injected current

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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