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Fundamentals and Applications of Magnetic Materials$
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Kannan M. Krishnan

Print publication date: 2016

Print ISBN-13: 9780199570447

Published to Oxford Scholarship Online: December 2016

DOI: 10.1093/acprof:oso/9780199570447.001.0001

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Magnetic Surfaces, Interfaces, and Thin Films

Magnetic Surfaces, Interfaces, and Thin Films

Chapter:
(p.409) 10 Magnetic Surfaces, Interfaces, and Thin Films
Source:
Fundamentals and Applications of Magnetic Materials
Author(s):

Kannan M. Krishnan

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199570447.003.0010

Magnetic moment, order, and coupling depend on interatomic distance, coordination, and atomic volume. As such, they are different for surfaces and ultrathin films and, compared to the bulk, in two-dimensional structures, the coordination number decreases, the atomic volume expands, the magnetic moment increases, and the Curie temperature decreases. There is alsostrong connection between magnetism in reduced dimensions and the underlying electronic states, such as the spin-split bands and quantum well states. This is illustrated with numerous examples including: critical phenomena and long-range magnetic order in two dimensions (2D), artificially occurring metastable phases and the rich phase diagram of Fe in low dimensions, surface anisotropy, interface coupling and induced ferromagnetism, oscillatory exchange coupling, exchange-bias, and exchange-spring behaviour.

Keywords:   surface/interface anisotropy, metastable phases, oscillatory exchange coupling, exchange bias, exchange-spring, magnetism in reduced dimensions, critical phenomena, surface & interface anisotropy

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