MAGNETIC ORDER IN DY/LU SUPERLATTICES

被引:12
作者
BEACH, RS [1 ]
BORCHERS, JA [1 ]
ERWIN, RW [1 ]
FLYNN, CP [1 ]
MATHENY, A [1 ]
RHYNE, JJ [1 ]
SALAMON, MB [1 ]
机构
[1] NIST, GAITHERSBURG, MD 20899 USA
关键词
D O I
10.1016/0304-8853(92)91602-P
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Several superlattices containing alternate layers of the rare earth elements dysprosium and lutetium were grown by molecular beam epitaxy. Neutron diffraction shows that these samples develop a helical phase in the (approximately 40 angstrom) Dy layers at T(N) = 178 K which propagates coherently across the nonmagnetic Lu (20-55 angstrom thick). The Dy layers order ferromagnetically at temperatures which vary from 140 to 160 K (the ferromagnetic phase in the bulk material appears at 85 K). Below T(C) the ferromagnetic Dy layers may be either aligned or anti-aligned. The transition is accompanied by a distortion of the superlattice basal plane comparable to that which occurs in bulk Dy. We also observe an approximately 80 K increase in T(C) in thin Lu/Dy (< 150 angstrom)/Lu films. We discuss how the observed high T(C) may be related to the elastic coupling of the Dy to Lu.
引用
收藏
页码:1915 / 1917
页数:3
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