Vertical bistable switching of spin vortex in a circular magnetic dot

Kikuchi, Nobuaki; Okamoto, Satoshi; Kitakami, Osamu; Shimada, Y.; Kim, S. G.; Otani, Y.; Fukamichi, K.

doi:10.1063/1.1416132

Cited by 76 publications

(52 citation statements)

References 5 publications

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“…In order to store information using a vortex core, mechanisms for a controlled switching of its orientation are required. The direct reversal of vortex cores by means of an applied field oriented perpendicular to the plane requires large field values of more than 200 mT, 9 which gives an idea of the high stability of these structures. Recently, it has been demonstrated that the vortex core could be switched by means of sinusoidal low field pulses applied in the plane of the sample.…”

Section: Institut Für Festkörperforschung Iff-9 "Elektronische Eigensmentioning

confidence: 99%

Current-induced magnetic vortex core switching in a Permalloy nanodisk

Liu

Gliga

Hertel

et al. 2007

Applied Physics Letters

113

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We report on the switching of a magnetic vortex core in a sub-micron Permalloy disk, induced by a short current pulse applied in the film plane. Micromagnetic simulations including the adiabatic and non-adiabatic spin-torque terms are used to investigate the current-driven magnetization dynamics. We predict that a core reversal can be triggered by current bursts a tenth of a nanosecond long. The vortex core reversal process is found to be the same as when an external field pulse is applied. The control of a vortex core's orientation using current pulses introduces the technologically relevant possibility to address individual nanomagnets within dense arrays.Comment: 3 pages, 3 figure

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Section: Institut Für Festkörperforschung Iff-9 "Elektronische Eigensmentioning

confidence: 99%

Current-induced magnetic vortex core switching in a Permalloy nanodisk

Liu

Gliga

Hertel

et al. 2007

Applied Physics Letters

113

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“…This new area of "spintronics" [1] opens the possibility to use magnetic configuration control as an extra degree of freedom for tuning the electric transport properties. The materials with high degree of spin polarization are the most desired for potential application in metal/insulator/metal devices [2], and magnetic multilayer geometries [3,4].…”

Section: Introductionmentioning

confidence: 99%

Bistable memory effect in chromium oxide junctions

et al. 2002

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Magnetotransport properties of granular CrO 2 /Cr 2 O 3 films made of CrO 2 crystals covered by 1-2 nm native insulating Cr 2 O 3 are presented. Electrical properties of a limited number of grains measured in series and parallel (10 to 15 grains) reveal intergrain tunneling characteristics. At lowest temperatures, a well pronounced zero bias anomaly indicates that impurities in the junctions block the electronic flow.Hysteresis in the IV curves are observed at intermediate temperatures on zero-field cooled samples. Changing the polarity of a short excitation pulse (100ns) of amplitude smaller than 1 V triggers a change in the zero-bias resistance by 10-50%. These states are stable and well reproducible in the temperature interval ranging from 100K to 250K. Applying an external magnetic field cancels the IV hysteresis. The resistance of the devices in the kΩ range, the potential high-speed for writing and reading the resistance sate, make these systems interesting candidates for magnetic non-volatile memories.

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“…Vortex chirality has been controlled in confined geometries using various techniques 16,17 . Manipulation of the vortex core polarity has been shown in individual elements by resonant in-plane 18,19 and perpendicular magnetic fields 20 , rotating magnetic fields 21 , pulsed currents 22 and spin-polarized currents 23 . However, control of the vortex core polarities in interacting vortex-state magnetic dots remains a challenge.…”

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confidence: 99%

From chaos to selective ordering of vortex cores in interacting mesomagnets

et al. 2012

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A spin vortex consists of an in-plane curling magnetization and a small core region (B10 nm) with out-of-plane magnetization. An oscillating field or current induce gyrotropic precession of the spin vortex. Dipole-dipole and exchange coupling between the interacting vortices may lead to excitation of collective modes whose frequencies depend on the core polarities. Here we demonstrate an effective method for controlling the relative core polarities in a model system of overlapping Ni 80 Fe 20 dots. This is achieved by driving the system to a chaotic regime of continuous core reversals and subsequently relaxing the cores to steady-state motion. It is shown that any particular core polarity combination (and therefore the spectral response of the entire system) can be deterministically preselected by tuning the excitation frequency or external magnetic field. We anticipate that this work would benefit the future development of magnonic crystals, spin-torque oscillators, magnetic storage and logic elements.

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Vertical bistable switching of spin vortex in a circular magnetic dot

Cited by 76 publications

References 5 publications

Current-induced magnetic vortex core switching in a Permalloy nanodisk

Current-induced magnetic vortex core switching in a Permalloy nanodisk

Bistable memory effect in chromium oxide junctions

From chaos to selective ordering of vortex cores in interacting mesomagnets

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