SUBSTRATE-INDUCED MAGNETIC-ORDERING OF RARE-EARTH OVERLAYERS

被引：34

作者：

DOWBEN, PA ^{[1
]}

LAGRAFFE, D ^{[1
]}

LI, DQ ^{[1
]}

MILLER, A ^{[1
]}

ZHANG, L ^{[1
]}

DOTTL, L ^{[1
]}

ONELLION, M ^{[1
]}

机构：

[1] UNIV WISCONSIN,MADISON,WI 53706

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.43.3171

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the magnetic ordering of terbium overlayers on Cu(100) and Ni(111), using angle-resolved photoemission. The 5p3/2 to 5p1/2 shallow-core-level branching ratios in different photoemission geometries provide a measure of the magnetic ordering in rare-earth-metal overlayers as a result of final-state effects in photoemission. We find that ferromagnetic substrates order paramagnetic terbium overlayers. This induced magnetic ordering is not a crystal-field effect and can be modeled by Ginzburg-Landau theory. Application of Ginzburg-Landau theory to our results suggests that the correlation length of paramagnetic terbium kappa-1 is between 2.5 and 3.5 angstrom. Reversible increases in the extent of magnetic ordering at temperatures below the Tb Curie temperature are observed for terbium overlayers on both Cu(100) and Ni(111).

引用

页码：3171 / 3179

页数：9

共 74 条

[1]

ASHCROFT NW, 1976, SOLID STATE PHYS, P663

[2] X-RAY PHOTOEMISSION STUDY OF OUTERMOST LEVELS OF RARE-EARTH METALS [J].