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The ferromagnetic transition and domain structure in LiHoF4
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.ORCID iD: 0000-0003-3228-2826
2009 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 87, no 2Article in journal (Refereed) Published
Abstract [en]

Using Monte Carlo simulations we verify that the rare-earth compound LiHoF4 is a very good realization of a dipolar Ising model. With only one free parameter our calculations for the magnetization, specific heat and inverse susceptibility match experimental data at a quantitative level in the 0.5-3 kelvin range, including the ferromagnetic transition at 1.53 K. Using parallel tempering methods and reaching system sizes up to 32000 dipoles with periodic boundary conditions, we are able to give evidence of the logarithmic corrections predicted in renormalization group theory. Due to the long range and angular dependence of the dipolar model, sample shape and domains play a crucial role in the ordered state. We consider surface corrections to Griffiths's theorem, which arise infinite macroscopic samples and lead to a theory of magnetic domains. We find a domain wall energy of 0.059 erg/cm(2) and predict that the ground-state domain structure for cylinders with a demagnetization factor N > 0 consists of thin parallel sheets of opposite magnetization, with a width depending on the demagnetization factor.

Place, publisher, year, edition, pages
2009. Vol. 87, no 2
Keyword [en]
LITHIUM HOLMIUM FLUORIDE, CRITICAL-BEHAVIOR, LOGARITHMIC CORRECTIONS, COMPUTER-SIMULATION, MONTE-CARLO, MAGNET, PHASE, MODEL, CRYSTAL, DIPOLES
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-13943DOI: 10.1209/0295-5075/87/27007ISI: 000269665400027Scopus ID: 2-s2.0-79051468890OAI: oai:DiVA.org:kth-13943DiVA: diva2:328509
Note
QC 20100705Available from: 2010-07-05 Created: 2010-07-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Statics, Domain Structure and Dynamics in the Dilute Dipolar Magnet LiHoF4
Open this publication in new window or tab >>Statics, Domain Structure and Dynamics in the Dilute Dipolar Magnet LiHoF4
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2009. v, 59 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:52
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-11166 (URN)978-91-7415-424-5 (ISBN)
Public defence
2009-09-25, Sal FD51, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100624Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2010-07-05Bibliographically approved

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