Neutron diffraction and reflectivity studies of the Cr Neel transition in Fe/Cr(001) superlattices

被引：25

作者：

Fullerton, EE ^{[1
]}

Adenwalla, S ^{[1
]}

Felcher, GP ^{[1
]}

Riggs, KT ^{[1
]}

Sowers, CH ^{[1
]}

Bader, SD ^{[1
]}

Robertson, JL ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN

来源：

PHYSICA B | 1996年 / 221卷 / 1-4期

关键词：

D O I：

10.1016/0921-4526(95)00951-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The effects on the interlayer coupling of the Cr Nel transition is studied in Fe/Cr(001) superlattices. The Neel transition is suppressed for Cr layer thickness < 42 Angstrom. For > 42 Angstrom of Cr, the Neel temperature T-N initially increases rapidly and then asymptotically approaches its bulk value with a three-dimensional transition-temperature shirt exponent value of lambda = 1.4 +/- 0.3. Neutron diffraction confirms both the Cr antiferromagnetic order and the existence of the incommensurate, transverse spin density wave whose nesting wave vector is the same as that of bulk Cr. The ordering of the Cr dramatically alters the coupling of the Fe layers. The biquadratic Fe interlayer coupling observed for T > T-N vanishes below T-N as confirmed by polarized neutron reflectivity. The behavior can be understood in terms of finite-size and spin frustration effects at rough Fe-er interfaces.

引用

页码：370 / 376

页数：7

共 32 条

[21]

RUCKER U, IN PRESS J APPL PHYS

[22] DOMAIN OBSERVATIONS ON FE-CR-FE LAYERED STRUCTURES - EVIDENCE FOR A BIQUADRATIC COUPLING EFFECT [J].