Presence and absence of antiferromagnetic coupling and giant magnetoresistance in sputtered and evaporated permalloy/copper multilayers

被引:21
作者
Reiss, G
van Loyen, L
Lucinski, T
Elefant, D
Bruckl, H
Mattern, N
Rennekamp, R
Ernst, W
机构
[1] Inst Solid State & Mat Res Dresden, D-01171 Dresden, Germany
[2] Univ Bielefeld, Fac Phys, D-33501 Bielefeld, Germany
[3] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
关键词
giant magnetoresistance; magnetic multilayers; roughness;
D O I
10.1016/S0304-8853(97)01151-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In multilayered thin films consisting of permalloy (Ni80Fe20) and copper, a strong antiferromagnetic coupling and a related giant magnetoresistance can be found which oscillates with the thickness of the copper spacer layers. This, however, is usually detected only in sputtered films, whereas evaporated multilayers often show no or only a very weak coupling and giant magnetoresistance. Here, we report on a comparative study of sputtered and evaporated multilayers. In the first maximum of the antiferromagnetic coupling, i.e. at a copper thickness of 0.9 nm, our sputtered films exhibit a saturation field of up to 1000 Oe and values of the giant magnetoresistance of up to 22% at room temperature at a permalloy thickness of about 2 nm. In contrast to this, the corresponding evaporated multilayers do not show any sign of antiferromagnetic coupling. A subsequent analysis of the films by cross-sectional transmission electron microscopy imaging indicates, in small regions, a good and a poor multilayered structure for sputtered and evaporated films, respectively. X-ray reflectivity measurements and atomic force imaging of the surfaces pointed to an increased interface roughness in the evaporated films. Thus we conclude that the absence of the antiferromagnetic coupling in the evaporated films should be related to an increased roughness of the layer interface and not to interdiffusion. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:281 / 288
页数:8
相关论文
共 8 条
[1]   GIANT MAGNETORESISTANCE OF (001)FE/(001) CR MAGNETIC SUPERLATTICES [J].
BAIBICH, MN ;
BROTO, JM ;
FERT, A ;
VANDAU, FN ;
PETROFF, F ;
EITENNE, P ;
CREUZET, G ;
FRIEDERICH, A ;
CHAZELAS, J .
PHYSICAL REVIEW LETTERS, 1988, 61 (21) :2472-2475
[2]   ENHANCED MAGNETORESISTANCE IN LAYERED MAGNETIC-STRUCTURES WITH ANTIFERROMAGNETIC INTERLAYER EXCHANGE [J].
BINASCH, G ;
GRUNBERG, P ;
SAURENBACH, F ;
ZINN, W .
PHYSICAL REVIEW B, 1989, 39 (07) :4828-4830
[3]   MAGNETIC-FIELD SENSORS USING GMR MULTILAYER [J].
DAUGHTON, J ;
BROWN, J ;
CHEN, E ;
BEECH, R ;
POHM, A ;
KUDE, W .
IEEE TRANSACTIONS ON MAGNETICS, 1994, 30 (06) :4608-4610
[4]   ELECTRONIC TRANSPORT-PROPERTIES AND THICKNESS DEPENDENCE OF THE GIANT MAGNETORESISTANCE IN CO/CU MULTILAYERS [J].
ECKL, T ;
REISS, G ;
BRUCKL, AH ;
HOFFMANN, H .
JOURNAL OF APPLIED PHYSICS, 1994, 75 (01) :362-367
[5]   LAYERED MAGNETIC-STRUCTURES - EVIDENCE FOR ANTIFERROMAGNETIC COUPLING OF FE LAYERS ACROSS CR INTERLAYERS [J].
GRUNBERG, P ;
SCHREIBER, R ;
PANG, Y ;
BRODSKY, MB ;
SOWERS, H .
PHYSICAL REVIEW LETTERS, 1986, 57 (19) :2442-2445
[6]   GIANT MAGNETORESISTANCE IN NI-FE/CU MULTILAYERS FORMED BY ION-BEAM SPUTTERING [J].
NAKATANI, R ;
DEI, T ;
KOBAYASHI, T ;
SUGITA, Y .
IEEE TRANSACTIONS ON MAGNETICS, 1992, 28 (05) :2668-2670
[7]   OSCILLATIONS IN GIANT MAGNETORESISTANCE AND ANTIFERROMAGNETIC COUPLING IN [NI81FE19/CU]N MULTILAYERS [J].
PARKIN, SSP .
APPLIED PHYSICS LETTERS, 1992, 60 (04) :512-514
[8]   Giant magnetoresistance in evaporated Ni-Fe/Cu and Ni-Fe-Co/Cu multilayers [J].
Zeltser, AM ;
Smith, N .
JOURNAL OF APPLIED PHYSICS, 1996, 79 (12) :9224-9230