| Issue |
Europhys. Lett.
Volume 42, Number 4, May II 1998
|
|
|---|---|---|
| Page(s) | 473 - 478 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00274-6 | |
| Published online | 01 September 2002 | |
Field-tuned quantum tunnelling of the magnetization in small magnetic particles
1
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
Received:
27
October
1997
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.