Characteristics of 360°-domain walls observed by magnetic force microscope in exchange-biased NiFe films

被引:27
作者
Cho, HS [1 ]
Hou, CH [1 ]
Sun, M [1 ]
Fujiwara, H [1 ]
机构
[1] Univ Alabama, Ctr Informat Technol, Tuscaloosa, AL 35487 USA
关键词
D O I
10.1063/1.369110
中图分类号
O59 [应用物理学];
学科分类号
摘要
The characteristics of 360 degrees domain walls have been investigated by magnetic force microscopy (MFM) in glass/Ta(10 nm)/NiFe(7.2 nm)/FeMn(8.0 nm)Ta(5 nm). The sample was prepared by radio-frequency-magnetron sputtering and characterized with a vibrating sample magnetometer. Both closed and line types of 360 degrees domain walls were observed. The closed type (loop) walls include circular, ellipsoidal, and irregular shapes of domain wall, the long axis of which is generally perpendicular to the overall easy direction (pinned direction) of the exchange biased NiFe film. 360 degrees wall loops were also classified by their chirality. Many 360 degrees domain walls were observed near defects and the measured wall thickness ranged from 1.5 to 3 mu m. The magnetic structure of the 360 degrees loop was verified by simulations using a simplified model of the MFM imaging process. The formation of a 360 degrees wall loops appears to originate from the rotational nature of the magnetization in the exchange-biased film, which comes from the distribution of the unidirectional anisotropy. (C) 1999 American Institute of Physics. [S0021-8979(99)42608-8].
引用
收藏
页码:5160 / 5162
页数:3
相关论文
共 15 条
[1]  
ANTHONY T, 1994, IEEE T MAGN, V30, P819
[2]  
CHO HM, UNPUB
[3]   GIANT MAGNETORESISTANCE IN SOFT FERROMAGNETIC MULTILAYERS [J].
DIENY, B ;
SPERIOSU, VS ;
PARKIN, SSP ;
GURNEY, BA ;
WILHOIT, DR ;
MAURI, D .
PHYSICAL REVIEW B, 1991, 43 (01) :1297-1300
[4]   COUPLED WALLS IN MULTILAYER FILMS [J].
FELDTKEL.E .
JOURNAL OF APPLIED PHYSICS, 1968, 39 (2P2) :1181-&
[5]  
Feldtkeller E., 1962, Z ANGEW PHYS, V14, P195
[6]   MAGNETIZATION REVERSAL MECHANISMS IN NIFE/CU/NIFE/FEMN SPIN-VALVE STRUCTURES [J].
GILLIES, MF ;
CHAPMAN, JN ;
KOOLS, JCS .
JOURNAL OF APPLIED PHYSICS, 1995, 78 (09) :5554-5562
[7]   MAGNETIC FORCE MICROSCOPY - CURRENT STATUS AND FUTURE-TRENDS [J].
HARTMANN, U ;
GODDENHENRICH, T ;
HEIDEN, C .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1991, 101 (1-3) :263-270
[8]   360-DEGREES AND 0-DEGREES WALLS IN MULTILAYER PERMALLOY-FILMS [J].
HEYDERMAN, LJ ;
NIEDOBA, H ;
GUPTA, HO ;
PUCHALSKA, IB .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1991, 96 (1-3) :125-136
[9]   TEM INVESTIGATION OF THE MAGNETIZATION PROCESSES IN EXCHANGE-COUPLED MULTILAYER FILMS [J].
HEYDERMAN, LJ ;
CHAPMAN, JN ;
PARKIN, SSP .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1994, 138 (03) :344-354
[10]  
Hubert A, 1997, PHYS STATUS SOLIDI B, V204, P817, DOI 10.1002/1521-3951(199712)204:2<817::AID-PSSB817>3.0.CO