Theory of quantum tunneling of the magnetization in magnetic particles

H. De Raedt, S. Miyashita, Keiji Saitou, D. García-Pablos, N. García

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

We study the response of the magnetization to a time-dependent applied magnetic field H(t) 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 dH(t)/dt, 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
Publication statusPublished - 1997 Nov 1
Externally publishedYes

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stairways
Magnets
Magnetization
magnets
magnetization
Hysteresis
hysteresis
curves
Electron energy levels
energy levels
Magnetic fields
magnetic fields
Temperature
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

De Raedt, H., Miyashita, S., Saitou, K., García-Pablos, D., & García, N. (1997). Theory of quantum tunneling of the magnetization in magnetic particles. Physical Review B - Condensed Matter and Materials Physics, 56(18), 11761-11768.

Theory of quantum tunneling of the magnetization in magnetic particles. / De Raedt, H.; Miyashita, S.; Saitou, Keiji; García-Pablos, D.; García, N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 18, 01.11.1997, p. 11761-11768.

Research output: Contribution to journalArticle

De Raedt, H, Miyashita, S, Saitou, K, García-Pablos, D & García, N 1997, 'Theory of quantum tunneling of the magnetization in magnetic particles', Physical Review B - Condensed Matter and Materials Physics, vol. 56, no. 18, pp. 11761-11768.
De Raedt, H. ; Miyashita, S. ; Saitou, Keiji ; García-Pablos, D. ; García, N. / Theory of quantum tunneling of the magnetization in magnetic particles. In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 56, No. 18. pp. 11761-11768.
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