A superparamagnetic state induced by a spin reorientation transition in ultrathin magnetic films

Yousuke Norizuki, Munetaka Sasaki

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate a spin reorientation transition (SRT) in ultrathin magnetic films by Monte-Carlo simulations. We assume that the lateral size of the film is relatively small and it has a single-domain structure. To gain insights into the SRT, we measure a free-energy as a function of perpendicular and in-plane magnetizations. As a result, we find that the system is in a superparamagnetic state at the SRT temperature. The disappearance of magnetization around the SRT temperature, which is observed in experiments, emerges due to dynamical fluctuations in magnetization which are inherent in the superparamagnetic state. This observation is in contrast to that in large ultrathin magnetic films that the disappearance of magnetization is caused by a static magnetic structure with many complex domains.

Original languageEnglish
Article number044706
Journaljournal of the physical society of japan
Volume82
Issue number4
DOIs
Publication statusPublished - 2013 Apr 1

Keywords

  • Monte-Carlo simulation
  • Spin reorientation transition
  • Ultrathin magnetic film

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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