Slow magnetization dynamics and energy barriers near vortex state nucleation in circular permalloy dots

Kakazei, G. N.; Ilyn, M.; Chubykalo‐Fesenko, O.; González, J.; Serga, Alexander A.; Chumak, A. V.; Beck, P. A.; Laegel, Bert; Hillebrands, B.; Guslienko, K. Yu.

doi:10.1063/1.3619846

Cited by 14 publications

(6 citation statements)

References 11 publications

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“…This behavior is similar to the one observed in isotropic materials. [13][14][15][16] For field applied along the EA direction, the annihilation field is 230 6 30 Oe (within our field resolution, this field is identical for all disks). It is interesting to note that the vortex core is not driven by the field up to the disk border.…”

mentioning

confidence: 95%

Magnetic vortices in single crystalline Fe-V disks with four folds magnetic anisotropy

Mitsuzuka

Lacour

Hehn

et al. 2012

Applied Physics Letters

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Magnetic vortices in circular disks made from Fe-V single crystal film have been studied by magnetic force microscopy. At remanent state, all the disks host a single vortex structure. The magnetic contrast differs drastically from the one usually observed in "traditional" materials and reveals the influence of the four folds anisotropy originating from the bcc structure of Fe-V lattice. Field dependence of vortex position has been studied. The vortex displacement is observed to be perpendicular to the field and depends on the field direction. Micromagnetic simulations reproduce quantitatively this behavior and explain the influence of cubic magnetic anisotropy.

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confidence: 95%

Magnetic vortices in single crystalline Fe-V disks with four folds magnetic anisotropy

Mitsuzuka

Lacour

Hehn

et al. 2012

Applied Physics Letters

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“…Magnetically soft films of Permalloy (Py) were the topic of special attention of researchers for many years, first of all, due to their wide use in micro- and nanoelectronics [ 4 , 5 ]. Currently, these films are the main functional material of a wide variety of devices for hard disk drives, magnetic recording devices, electronic navigation systems, position detection, object motion, and magnetic biosensors [ 6 , 7 , 8 ], as well as new promising spintronic devices (e.g., film storage devices information with high density based on magnetic vortices [ 9 , 10 ]). In electronic devices, Permalloy films are typically used in multilayer film structures such as, for example, spin valves [ 5 , 8 ] or multilayer structures with a giant magnetoimpedance effect [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Ni0.8Fe0.2/Ti Nanoscale Multilayers

et al. 2018

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The influence of the thickness of the Ni0.8Fe0.2 (Permalloy, Py) layers on the structural and magnetic properties of magnetron sputtered Py/Ti multilayers was studied. The thickness of the Py layers was varied in the interval of 8 to 30 Å. X-ray reflectivity scans evidence the existence of a well-defined layered structure in all the samples considered, but also the presence of a complex intermixed interface. The shape of both the temperature dependence of magnetization and the hysteresis loops of the multilayered structures depends strongly on Py thickness. Magnetic and reflectivity measurements were comparatively analyzed in order to better understand the structure of the samples, and specifically, their interfaces. In particular, the presence of small superparamagnetic Py at the interfaces of the samples, especially evident in the samples with the thinnest Py layers, seems confirmed by the magnetic measurements, agreeing well with the reflectivity results.

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“…The thin soft magnetic disk, the prototypical system containing a vortex, has therefore become an extensively investigated system. Properties studied include structure 4,5 , dynamical modes [6][7][8] , annihilation 9,10 , and creation 9,[11][12][13] . As each aspect of vortex physics is probed experimentally, and considered for technological applications, theoretical understanding via simulation and modeling is also advanced.…”

Section: Introductionmentioning

confidence: 99%

A Deformable Model for Magnetic Vortex Pinning

Burgess,

Losby,

Freeman

2012

Preprint

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A two-parameter analytical model of the magnetic vortex in a thin disk of soft magnetic material is constructed. The model is capable of describing the change in evolution of net vortex state magnetization and of core position when the vortex core interacts with a magnetic pinning site.The model employs a piecewise, physically continuous, magnetization distribution obtained by the merger of two extensively used one-parameter analytical models of the vortex state in a disk.Through comparison to numerical simulations of ideal disks with and without pinning sites, the model is found to accurately predict the magnetization, vortex position, hysteretic transitions, and 2-D displacement of the vortex in the presence of pinning sites. The model will be applicable to the quantitative determination of vortex pinning energies from measurements of magnetization.

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Slow magnetization dynamics and energy barriers near vortex state nucleation in circular permalloy dots

Cited by 14 publications

References 11 publications

Magnetic vortices in single crystalline Fe-V disks with four folds magnetic anisotropy

Magnetic vortices in single crystalline Fe-V disks with four folds magnetic anisotropy

Structural and Magnetic Properties of Ni0.8Fe0.2/Ti Nanoscale Multilayers

A Deformable Model for Magnetic Vortex Pinning

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