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Exchange Resonance Modes in a Hollow Sphere
Author(s) -
Aharoni A.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200206)231:2<547::aid-pssb547>3.0.co;2-7
Subject(s) - radius , resonance (particle physics) , eigenvalues and eigenvectors , physics , condensed matter physics , inner core , order (exchange) , function (biology) , ferromagnetism , atomic physics , molecular physics , quantum mechanics , computer security , finance , evolutionary biology , geophysics , computer science , economics , biology
The theory of the exchange resonance modes is extended to the case of a sphere with a non‐magnetic core, such as the fine particles of ferromagnetic alloys that are grown around a nucleus of noble metals. A first‐order calculation leads to modified eigenvalues as a function of the radius of the inner sphere, which turns out to be hardly noticeable for the inner radius used in the published experiments. For larger holes, this modification is negligibly small for some modes, but can be measurably large for other modes.