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Microscopic aspects of magnetic lattice demagnetizing factors
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
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2017 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 1, no 4, 044406Article in journal (Refereed) Published
Abstract [en]

The demagnetizing factor N is of both conceptual interest and practical importance. Considering localized magnetic moments on a lattice, we show that for nonellipsoidal samples, N depends on the spin dimensionality (Ising, XY, or Heisenberg) and orientation, as well as the sample shape and susceptibility. The generality of this result is demonstrated by means of a recursive analytic calculation as well as detailed Monte Carlo simulations of realistic model spin Hamiltonians. As an important check and application, we also make an accurate experimental determination of N for a representative collective paramagnet (i.e., the Dy2Ti2O7 spin ice compound) and show that the temperature dependence of the experimentally determined N agrees closely with our theoretical calculations. Our conclusion is that the well-established practice of approximating the true sample shape with "corresponding ellipsoids" for systems with long-range interactions will in many cases overlook important effects stemming from the microscopic aspects of the system under consideration.

Place, publisher, year, edition, pages
2017. Vol. 1, no 4, 044406
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-220295DOI: 10.1103/PhysRevMaterials.1.044406ISI: 000416582000002OAI: oai:DiVA.org:kth-220295DiVA: diva2:1169094
Note

QC 20171222

Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2017-12-22Bibliographically approved

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Twengström, MikaelHenelius, Patrik

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