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Physical Review B
Volumn 48, Issue 21, 1993, Pages 15812-15816
Giant energy product in nanostructured two-phase magnets
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EID: 0000996942     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.48.15812     Document Type: Article
Times cited : (1419)
References (27)
  • 15
    • 84931506482 scopus 로고    scopus 로고
    • It can be shown that higher-order anisotropy constants, small fluctuations of n vec, and magnetostatic effects for macroscopically homogeneous ellipsoids, do not influence the results obtained in the following sections.
  • 19
    • 84931506486 scopus 로고    scopus 로고
    • Brown's paradox is that the observed intrinsic coercivity Hc is always smaller than the value Hc> 2 K1/ μ0M0 calculated from the theory of nucleation in less finite-size homogeneous ellipsoids. In fact, real systems always exhibit a certain inhomogeneity which is the origin of the much smaller coercivity observed in practice. Here we avoid Brown's paradox by dealing with a system which is inhomogeneous on a scale smaller than δh, but which contains no micron-size inhomogeneities.
  • 24
    • 84931506487 scopus 로고    scopus 로고
    • R. Skomski, Ph.D. thesis, Technische Universität Dresden, 1991.
  • 26
    • 84931506484 scopus 로고    scopus 로고
    • For Ks< Kh, the small parameter of the perturbation series is Dc/ δh, where Dcapprox D is the correlation length of the inhomogeneities (cf. Ref. 14). If Dc< δh the exchange dominates, and the magnetization state is effectively homogeneous.
  • 27
    • 84931506485 scopus 로고    scopus 로고
    • A reversed nucleus will grow spontaneously if its radius exceeds c γ / μ0M02 where c is a constant of order unity and gamma is the domain-wall energy. If c =1 and γ = 30 mJ/m2, the critical radius is 10 nm. However, the thermal energy needed to produce such a nucleus must be at least 4 π r2gamma, or 4times 105 K.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.