Volume 42, Number 4, May II 1998
|Page(s)||473 - 478|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Field-tuned quantum tunnelling of the magnetization in small magnetic particles
Laboratorio de Física de Sistemas Pequeños y
Nanotecnología, Consejo Superior de Investigaciones Científicas -
Serrano 144, E-28006-Madrid, Spain
2 Institute for Theoretical Physics and Materials Science Centre, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands
Accepted: 26 March 1998
We present staircase magnetization curves for single-spin models of uniaxial magnets as obtained from the numerically exact solution of the time-dependent Schrödinger equation. Steps are shown to correspond to field-tuned tunnelling between different pairs of nearly degenerate energy levels. The role played by second-order and fourth-order transverse anisotropy, the transverse field and the orientation and sweep speed of the applied field are studied. Magnetization curves for excited and non-saturated initial states are also presented. These results are discussed in relation to recent experiments on high-spin compounds.
PACS: 75.50.Tt – Fine-particle systems / 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects
© EDP Sciences, 1998
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