Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots

被引：103

作者：

Lee, Ki-Suk ^{[1
,2
]}

Kim, Sang-Koog ^{[1
,2
]}

Yu, Young-Sang ^{[1
,2
]}

Choi, Youn-Seok ^{[1
,2
]}

Guslienko, Konstantin Yu. ^{[1
,2
]}

Jung, Hyunsung ^{[1
,2
]}

Fischer, Peter ^{[3
]}

机构：

[1] Seoul Natl Univ, Res Ctr Spin Dynam & Spin Wave Devices, Seoul 151744, South Korea

[2] Seoul Natl Univ, Dept Mat Sci & Engn, Nanospin Lab, Seoul 151744, South Korea

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.101.267206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The universal criterion for ultrafast vortex-core switching between the up- and down-core bistates in soft magnetic nanodots is investigated by micromagnetic simulations along with vortex-core switching that occurs whenever the velocity of vortex-core motion reaches its critical velocity, v(cri) = (1.66 +/- 0.18)gamma root A(ex) (e.g., v(cri) 330 +/- 37 m/s for Permalloy), with the exchange stiffness A(ex) and the gyromagnetic ratio gamma. On the basis of the universality of v(cri), phase diagrams for the vortex-core switching event and switching time with respect to both the amplitude and frequency of a circularly rotating magnetic field are calculated.

引用

页数：4

共 33 条

[1] Time-resolved x-ray microscopy of spin-torque-induced magnetic vortex gyration [J].

Bolte, Markus ;

Meier, Guido ;

Krueger, Benjamin ;

Drews, Andre ;

Eiselt, Rene ;

Bocklage, Lars ;

Bohlens, Stellan ;

Tyliszczak, Tolek ;

Vansteenkiste, Arne ;

Van Waeyenberge, Bartel ;

Chou, Kang Wei ;

Puzic, Aleksandar ;

Stoll, Hermann .

PHYSICAL REVIEW LETTERS, 2008, 100 (17)

[2] Driven dynamic mode splitting of the magnetic vortex translational resonance [J].

Buchanan, K. S. ;

Grimsditch, M. ;

Fradin, F. Y. ;

Bader, S. D. ;

Novosad, V. .

PHYSICAL REVIEW LETTERS, 2007, 99 (26)

[3] Vortex core-driven magnetization dynamics [J].

Choe, SB ;

Acremann, Y ;

Scholl, A ;

Bauer, A ;

Doran, A ;

Stöhr, J ;

Padmore, HA .

SCIENCE, 2004, 304 (5669) :420-422

[4] Spintronics - Change of direction [J].

Cowburn, Russell P. .

NATURE MATERIALS, 2007, 6 (04) :255-256

[5] Polarization Selective Magnetic Vortex Dynamics and Core Reversal in Rotating Magnetic Fields [J].

Curcic, Michael ;

Van Waeyenberge, Bartel ;

Vansteenkiste, Arne ;

Weigand, Markus ;

Sackmann, Vitalij ;

Stoll, Hermann ;

Faehnle, Manfred ;

Tyliszczak, Tolek ;

Woltersdorf, Georg ;

Back, Christian H. ;

Schuetz, Gisela .

PHYSICAL REVIEW LETTERS, 2008, 101 (19)

[6]

*EPAPS, EPRLTAO102058902 EPA

[7] Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots [J].

Guslienko, K. Yu. .

APPLIED PHYSICS LETTERS, 2006, 89 (02)

[8] Dynamic origin of vortex core switching in soft magnetic nanodots [J].

Guslienko, Konstantin Yu. ;

Lee, Ki-Suk ;

Kim, Sang-Koog .

PHYSICAL REVIEW LETTERS, 2008, 100 (02)

[9] Magnetic vortex core dynamics in cylindrical ferromagnetic dots [J].

Guslienko, KY ;

Han, XF ;

Keavney, DJ ;

Divan, R ;

Bader, SD .

PHYSICAL REVIEW LETTERS, 2006, 96 (06)

[10] Eigenfrequencies of vortex state excitations in magnetic submicron-size disks [J].

Guslienko, KY ;

Ivanov, BA ;

Novosad, V ;

Otani, Y ;

Shima, H ;

Fukamichi, K .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :8037-8039

← 1 2 3 4 →