Imaging and magnetometry of switching in nanometer-scale iron particles

Gider, S.; Shi, Jing; Awschalom, D. D.; Hopkins, P. F.; Campman, K. L.; Gossard, A. C.; Kent, A. D.; Molnár, S. von

doi:10.1063/1.118032

Cited by 51 publications

(19 citation statements)

References 11 publications

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“…Sophisticated techniques continue to be used to characterize magnetic microstructure in thin films [1], superlattices [2], particle arrays [3][4][5][6], and devices [7,8]. Solutions to the Landau-Lifshitz-Gilbert-Langevin (LLGL) equations [9][10][11][12] indicate that the measured magnetization states depend sensitively on the initial magnetic state of the system and on interface effects such as those responsible for giant magnetoresistence [13] and delocalized exchange [14,15].…”

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confidence: 99%

Vortex Flux Channeling in Magnetic Nanoparticle Chains

et al. 2003

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A detailed understanding of the formation of magnetic vortices in closely spaced ferromagnetic nanoparticles is important for the design of ultra-high-density magnetic devices. Here, we use electron holography and micromagnetic simulations to characterize three-dimensional magnetic vortices in chains of FeNi nanoparticles. We show that the diameters of the vortex cores depend sensitively on their orientation with respect to the chain axis and that vortex formation can be controlled by the presence of smaller particles in the chains.

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confidence: 99%

Vortex Flux Channeling in Magnetic Nanoparticle Chains

et al. 2003

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“…[1][2][3][4][5][6][7] In this connection considerable efforts have been applied to the investigation of coercivity, thermal stability, and recording properties of patterned systems. [8][9][10][11][12][13][14][15][16] However most studies focused on the investigation of the array's averaged properties and inhomogeneous dot's switching in an external homogeneous magnetic field. In this article we discuss the peculiarities of the magnetization reversal of individual dots in a nonhomogeneous magnetic field.…”

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confidence: 99%

Magnetic force microscope tip-induced remagnetization of CoPt nanodisks with perpendicular anisotropy

Миронов

Gribkov

Вдовичев

et al. 2009

Journal of Applied Physics

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We report on the results of a magnetic force microscopy investigation of remagnetization processes in arrays of CoPt nanodisks with diameters of 35 and 200 nm and a thickness of 9.8 nm fabricated by e-beam lithography and ion etching. The controllable magnetization reversal of individual CoPt nanodisks by the magnetic force microscope ͑MFM͒ tip-induced magnetic field was demonstrated. We observed experimentally two essentially different processes of tip-induced remagnetization. Magnetization reversal of 200 nm disks was observed when the probe moved across the particle while in case of 35 nm nanodisks one-touch remagnetization was realized. Micromagnetic modeling based on the Landau-Lifshitz-Gilbert ͑LLG͒ equation demonstrated that the tip-induced magnetization reversal occurs through the essentially inhomogeneous states. Computer simulations confirmed that in case of 200 nm disks the mechanism of embryo nucleation with reversed magnetization and further dynamic propagation following the probe moving across the particle was realized. On the other hand one-touch remagnetization of 35 nm disks occurs through the inhomogeneous vortexlike state. Micromagnetic LLG simulations showed that magnetization reversal in an inhomogeneous MFM probe field has a lower energy barrier in comparison with the mechanism of coherent rotation, which takes place in a homogeneous external magnetic field.

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“…However, a magnetization-switching field H s of each dot is difficult to control and, in fact, a large dispersion of H s is reported in the patterned media so far. The dispersion of H s in dot-arrays was considered to arise from the spatial dispersion of magnetic easy axis, fluctuation of dot shape and the magnetostatic interaction among the dots [3][4][5]. In this paper, the magnetization reversal process in CoPt dot-array has been studied by magnetic force microscope (MFM) to make clear the mechanism for H s -distribution in dot-arrays.…”

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confidence: 98%