SPIN-FLIP ANOMALIES IN EPITAXIAL ALPHA-FE2O3 FILMS BY MOSSBAUER-SPECTROSCOPY

被引：40

作者：

FUJII, T ^{[1
]}

TAKANO, M ^{[1
]}

KAKANO, R ^{[1
]}

ISOZUMI, Y ^{[1
]}

BANDO, Y ^{[1
]}

机构：

[1] KYOTO UNIV,INST CHEM RES,UJI,KYOTO 611,JAPAN

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1994年 / 135卷 / 02期

关键词：

D O I：

10.1016/0304-8853(94)90351-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin-flip transition of 1000 angstrom-thick alpha-Fe2O3 films was investigated by conversion electron Mossbauer spectroscopy from 2.5 to 673 K. The films were epitaxially formed on alpha-Al2O3 single-crystalline substrates by a reactive vapor deposition method. Not only the transition temperature but also the spin axis were found to strongly depend upon the film orientation, probably as a result of anisotropic lattice strains caused by interactions with the substrate. For a (102)-oriented film the transition takes place at about 400 K, much higher than the Morin transition temperature (260 K) of the free crystal, and the spin axis lying within the (102) plane above 400 K changes almost normal to the plane at room temperature and below: the normal makes 57.6-degrees with the spin axis of the free crystal. A (001)-oriented film, on the other hand, does not show any transition at least down to 2.5 K.

引用

页码：231 / 236

页数：6

共 17 条

[1]

ARTMAN JO, 1965, PHYS REV A, V138, P912

[2] EXPERIMENTS ON FERROMAGNETIC SURFACES AND THIN-FILMS [J].