The universal criterion for switching a magnetic vortex core in soft magnetic nanodots Page: 3 of 21
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In magnetic thin films [1,2] and patterned magnetic elements of submicron (or
smaller) size [3], a nontrivial spiral magnetization (M) configuration occurs and has been
experimentally observed in both static and dynamic states. This magnetic nanostructure, the
so-called "magnetic vortex" has an in-plane curling M along with an out-of-plane M at the
core area stretching over of a few tens of nm in size [3]. Owing to a high thermal stability of
this static structure [4] as well as the bi-state M orientations of the tiny vortex core (VC), the
magnetic vortex has been received considerable attention as an information carrier of binary
digits "0" and "1" in nonvolatile information storage technologies [4]. Furthermore, very
recently, experimental, theoretical, and simulation studies have explored a rich variety of the
dynamic properties of the magnetic vortex, including ultrafast VC switching by linearly
oscillating [5-8] and circularly rotating [9-11] in-plane magnetic fields or spin-polarized
currents [12,13], with extremely low-power consumption. The underlying mechanism and
physical origin of ultrafast VC switching have also been found [8,14]. These rich dynamic
properties stimulate continuing intensive studies of patterned nanodots in the vortex states
targeting towards a fundamental understanding of their dynamics and real applications to a
new class of nonvolatile random access memory and patterned information storage media.
Such new conceptual devices using ultrafast, low-power VC switching becomes an emerging
issue in the research areas of nanomagnetism and M dynamics.
Although, the fundamental understanding of VC reversal and vortex gyrotropic2
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Lee, K. S.; Kim, S. K.; Yu, Y. S.; Choi, Y. S.; Guslienko, K. Y.; Jung, H. et al. The universal criterion for switching a magnetic vortex core in soft magnetic nanodots, article, October 1, 2008; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc895052/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.