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

Yousuke Norizuki, Munetaka Sasaki

研究成果: Article査読

抄録

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.

本文言語English
論文番号044706
ジャーナルjournal of the physical society of japan
82
4
DOI
出版ステータスPublished - 2013 4

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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