Quantum Monte Carlo simulation of thin magnetic films
2002 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 66, no 9Article in journal (Refereed) Published
The stochastic series expansion quantum Monte Carlo method is used to study thin ferromagnetic films, described by a Heisenberg model including local anisotropies. The magnetization curve is calculated, and the results compared to Schwinger boson and many-body Green's function calculations. A transverse field is introduced in order to study the reorientation effect, in which the magnetization changes from out of plane to in plane. Since the approximate theoretical approaches above differ significantly from each other, and the Monte Carlo method is free of systematic errors, the calculation provides an unbiased check of the approximate treatments. By studying quantum spin models with local anisotropies, varying spin size, and a transverse field, we also demonstrate the general applicability of the recent cluster-loop formulation of the stochastic series expansion quantum Monte Carlo method.
Place, publisher, year, edition, pages
2002. Vol. 66, no 9
ferromagnetic-films, ultrathin films, spin systems, anisotropy, reorientation, monolayer, expansion, models
IdentifiersURN: urn:nbn:se:kth:diva-21943DOI: 10.1103/PhysRevB.66.094407ISI: 000178383200061OAI: oai:DiVA.org:kth-21943DiVA: diva2:340641
QC 201005252010-08-102010-08-10Bibliographically approved