Vortex chirality in exchange-biased elliptical magnetic rings

被引：46

作者：

Jung, W. ^{[1
]}

Castano, F. J. ^{[1
]}

Ross, C. A. ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.97.247209

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The flux-closed or "vortex" state in thin-film magnetic rings has been proposed as a data storage token, but it has proven difficult to control the vortex chirality in a simple manner. Here, a model is described that predicts the vortex chirality of an elliptical magnetic ring as a function of the direction of the applied field and of the exchange bias, based on the change in energy of the system as the domain walls move. Experimental measurements of chirality in Co and Co/IrMn magnetic rings with 3.2 mu m major axis are in excellent agreement with the model. The vortex circulation direction can therefore be tailored with an appropriate combination of applied field direction and exchange bias direction with respect to the major axis.

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页数：4

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共 21 条

[1] Magnetic configurations in 160-520-nm-diameter ferromagnetic rings -: art. no. 144421 [J].

Castaño, FJ ;

Ross, CA ;

Eilez, A ;

Jung, W ;

Frandsen, C .

PHYSICAL REVIEW B, 2004, 69 (14) :144421-1

[2] Magnetization reversal in elliptical-ring nanomagnets [J].

Castaño, FJ ;

Ross, CA ;

Eilez, A .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2003, 36 (17) :2031-2035

[3] Room temperature magnetic quantum cellular automata [J].

Cowburn, RP ;

Welland, ME .

SCIENCE, 2000, 287 (5457) :1466-1468

[4] Single-domain circular nanomagnets [J].

Cowburn, RP ;

Koltsov, DK ;

Adeyeye, AO ;

Welland, ME ;

Tricker, DM .

PHYSICAL REVIEW LETTERS, 1999, 83 (05) :1042-1045

[5] Magnetization reversal in single-layer and exchange-biased elliptical-ring arrays -: art. no. 10K113 [J].

Jung, W ;

Castaño, FJ ;

Morecroft, D ;

Ross, CA ;

Menon, R ;

Smith, HI .

JOURNAL OF APPLIED PHYSICS, 2005, 97 (10)

[6] Controlled magnetic switching in single narrow rings probed by magnetoresistance measurements [J].

Kläui, M ;

Vaz, CAF ;

Bland, JAC ;

Wernsdorfer, W ;

Faini, G ;

Cambril, E .

APPLIED PHYSICS LETTERS, 2002, 81 (01) :108-110

[7] Vortex circulation control in mesoscopic ring magnets [J].

Kläui, M ;

Rothman, J ;

Lopez-Diaz, L ;

Vaz, CAF ;

Bland, JAC ;

Cui, Z .

APPLIED PHYSICS LETTERS, 2001, 78 (21) :3268-3270

[8] Magnetically pinned ring dots for spin valve or magnetic tunnel junction memory cells [J].

Nakatani, R ;

Yoshida, T ;

Endo, Y ;

Kawamura, Y ;

Yamamoto, M ;

Takenaga, T ;

Aya, S ;

Kuroiwa, T ;

Beysen, S ;

Kobayashi, H .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, 286 :31-36

[9] Magnetization chirality due to asymmetrical structure in Ni-Fe annular dots for high-density memory cells [J].

Nakatani, R ;

Yoshida, T ;

Endo, Y ;

Kawamura, Y ;

Yamamoto, M ;

Takenaga, T ;

Aya, S ;

Kuroiwa, T ;

Beysen, S ;

Kobayashi, H .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (11) :6714-6716

[10] Exchange bias in nanostructures [J].

Nogués, J ;

Sort, J ;

Langlais, V ;

Skumryev, V ;

Suriñach, S ;

Muñoz, JS ;

Baró, MD .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2005, 422 (03) :65-117