Asymmetric Domain Nucleation and Unusual Magnetization Reversal in Ultrathin Co Films with Perpendicular Anisotropy

Iunin, Yu. L.; Kabanov, Yuri; Никитенко, В. И.; Cheng, Xuemei; Clarke, David J.; Tretiakov, Oleg A.; Tchernyshyov, Oleg; Shapiro, Alexander J.; Shull, Robert D.; Chien, C. L.

doi:10.1103/physrevlett.98.117204

Cited by 55 publications

(37 citation statements)

References 33 publications

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“…2(a) and 2(b). These structures are similar to those observed after cycling the magnetization of Co=Pt multilayers with perpendicular anisotropy [25]: The magnetization in the center is the same as in the surrounding medium and is completely reversed in the annular region around the core. This texture can be viewed as two Skyrmions with opposite topological numbers (i.e., a Skyrmion and an anti-Skyrmion) nested into each other.…”

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confidence: 80%

Laser-Induced Magnetic Nanostructures with Tunable Topological Properties

et al. 2013

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We report the creation and real-space observation of magnetic structures with well-defined topological properties and a lateral size as low as about 150 nm. They are generated in a thin ferrimagnetic film by ultrashort single optical laser pulses. Thanks to their topological properties, such structures can be classified as Skyrmions of a particular type that does not require an externally applied magnetic field for stabilization. Besides Skyrmions, we are able to generate magnetic features with topological characteristics that can be tuned by changing the laser fluence. The stability of such features is accounted for by an analytical model based on the interplay between the exchange and the magnetic dipole-dipole interactions.

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confidence: 80%

Laser-Induced Magnetic Nanostructures with Tunable Topological Properties

et al. 2013

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The magnetization reversal process in these systems usually involves the formation of vertically correlated stripe domains, through the entire multilayer film stack resulting from a competition between ferromagnetic (FM) exchange, anisotropy and dipolar energies. 1 The energy balance can be further tailored through the addition of Ru spacer layers with appropriate thicknesses, which establishes antiferromagnetic (AF) interlayer exchange coupling.…”

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confidence: 99%

Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

et al. 2008

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TitleTemperature-dependent magnetization reversal in (Co/Pt)/Ru multilayers AbstractAntiferromagnetically coupled (Co/Pt)/Ru multilayers with perpendicular anisotropy have been shown to exhibit both vertically and laterally correlated magnetization reversal modes.In this work the magnetization reversal of a multilayer film whose layer thicknesses have been tuned to be at the phase boundary between the two reversal modes has been investigated as a function of temperature using the first-order reversal curve (FORC) method. At high temperatures reversal via vertically correlated stripe domains throughout the film thickness is observed, similar to that in Co/Pt films without the Ru spacers. At low temperatures antiferromagnetic (AF) interlayer exchange coupling dominates, and laterally correlated reversal is observed with an AF coupled remanent state. Under magnetic field cycling, dipolar fields can transform the sample back into a vertically correlated domain state, thus leading to an exotic behavior with FORC's existing outside the major hysteresis loop. Calculations show that the laterally correlated reversal mode is indeed slightly more stable, and the crossover to vertically correlated reversal can be induced by temperature as well as magnetic field.

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“…[1][2][3][4][5][6][7] These films typically undergo macroscopic magnetization reversal by nucleation and growth of microscopic domains. More generally, similar domain formation is observed in a wide range of other materials such as polymers, superconductors, liquid crystals, and ferrofluids, 8,9 which have drastically different interactions that govern their behaviors.…”

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Frustration driven stripe domain formation in Co/Pt multilayer films

Davies

Hellwig

Fullerton

et al. 2009

Applied Physics Letters

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We report microscopic mechanisms for an unusual magnetization reversal behavior in Co/Pt multilayers where some of the first-order reversal curves protrude outside of the major loop. Transmission x-ray microscopy reveals a fragmented stripe domain topography when the magnetic field is reversed prior to saturation, in contrast to an interconnected pattern when reversing from a saturated state. The different domain nucleation and propagation behaviors are due to unannihilated domains from the prior field sweep. These residual domains contribute to random dipole fields that impede the subsequent domain growth and prevent domains from growing as closely together as for the interconnected pattern.

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Asymmetric Domain Nucleation and Unusual Magnetization Reversal in Ultrathin Co Films with Perpendicular Anisotropy

Abstract: Y. L. Iunin et al., Phys. Rev. Lett. 98, 117204 (2007).

Cited by 55 publications

References 33 publications

Laser-Induced Magnetic Nanostructures with Tunable Topological Properties

Laser-Induced Magnetic Nanostructures with Tunable Topological Properties

Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

Frustration driven stripe domain formation in Co/Pt multilayer films

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