Published 1986 | Version v1
Report Open

Influence of the interaction anisotropy on the appearence of surface magnetism

Creators

Description

The phase diagram of the semi-infinite anisotropic Heinsenberg ferromagnet, with surface (bulk) coupling constant Js (JB) and anisotropy ηs (ηB), within a simple real space renormalization group scheme is studied. The ηs and ηB effects on the (multicritical) ratio Js/JB above which surface order becomes observable even if bulk order is absent. Enhancement occurs for an Ising-like free surface (ηs ∼ =1) on top of an isotropic-Heisenberg-like bulk (ηB ∼ =0). (Author)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (Portuguese)

Estuda-se o diagrama de fases do ferromagneto semi-infinito anisotropico de Heisenberg com constante de acoplamento de superficie ('bulk') Js (JB) e anisotropia ηs (ηB) dentro do esquema de grupo de renormalizacao do espaco real. Mostram-se os efeitos os de ηs e ηB sobre a taxa (multicritica) Js/JB, acima da qual a ordem da superficie se torna observavel mesmo que a ordem do volume esteja ausente. Aumento ocorre para uma superficie livre tipo Ising (ηs ∼ =1)) sobre um volume isotropico tipo Heisenberg (ηB ∼ =0. (Autor)

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Additional details

Publishing Information

Imprint Pagination
16 p.
Report number
CBPF-NF--022/86

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
18077616
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ANISOTROPY; COUPLING CONSTANTS; FERROMAGNETIC MATERIALS; HEISENBERG MODEL; INTERACTIONS; MAGNETISM; PHASE DIAGRAMS; RENORMALIZATION; SPACE GROUPS; SURFACES
Descriptors DEC
CRYSTAL MODELS; DIAGRAMS; INFORMATION; MAGNETIC MATERIALS; MATERIALS; MATHEMATICAL MODELS; SYMMETRY GROUPS