Theory of quantum tunneling of the magnetization in magnetic particles

H. De Raedt, S. Miyashita, K. Saito

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

We study the response of the magnetization to a time-dependent applied magnetic field (Formula presented) in a model for a uniaxial magnet. It is shown that a staircase structure in the magnetization curve results from Landau-Zener tunneling between different pairs of nearly-degenerate energy levels. This mechanism might be relevant to the analysis of the hysteresis of nanoscale magnets at low temperatures, allowing one to extract the energy splittings from the hysteresis curve. We investigate the dependence of the staircase structure on the sweep rate (Formula presented) and point out some universal features of the staircase in uniaxial magnets. We also study the effect of a step-wise (instead of continuous) increase in the field, and show that the size of the steps depends sensitively on the procedure used to change the applied field.

Original languageEnglish
Pages (from-to)11761-11768
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number18
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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