Angular Dependence of Torque in Anisotropic Permalloy Films

Doyle, William; Rudisill, J. Earl; Shtrikman, S.

doi:10.1063/1.1728442

Cited by 25 publications

(4 citation statements)

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“…The experimental data is fitted by applying the modified Kondorsky model, − which is valid for magnetization reversal processes governed by nucleation and motion of domain walls in uniaxial media taking pinning processes into account. Although the Kondorsky model was originally derived for hard-magnetic media, it can also be applied to describe soft-magnetic planar films. , Here, the magnetic anisotropy is due to the shape anisotropy of the elongated cap. The angle dependence of the normalized coercive field reads h c false( φ false) = H c false( φ false) H c false( φ = 0 false) = h + 1 − h cos false( φ false) with the longitudinal coercive field H c (φ = 0) = H 0 and h being the ratio between the anisotropy constant and the longitudinal coercive field.…”

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confidence: 99%

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Magnetically Capped Rolled-up Nanomembranes

et al. 2012

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Modifying the curvature in magnetic nanostructures is a novel and elegant way toward tailoring physical phenomena at the nanoscale, allowing one to overcome limitations apparent in planar counterparts. Here, we address curvature-driven changes of static magnetic properties in cylindrically curved magnetic segments with different radii of curvature. The curved architectures are prepared by capping nonmagnetic micrometer- and nanometer-sized rolled-up membranes with a soft-magnetic 20 nm thick permalloy (Ni(80)Fe(20)) film. A quantitative comparison between the magnetization reversal processes in caps with different diameters is given. The phase diagrams of magnetic equilibrium domain patterns (diameter versus length) are generated. For this, joint experimental, including X-ray magnetic circular dichroism photoelectron emission microscopy (XMCD-PEEM), and theoretical studies are carried out. The anisotropic magnetostatic interaction in cylindrically curved architectures originating from the thickness gradient reduces substantially the magnetostatic interaction between closely packed curved nanowires. This feature is beneficial for racetrack memory devices, since a much higher areal density might be achieved than possible with planar counterparts.

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“…Although the Kondorsky model was originally derived for hard-magnetic media, it can also be applied to describe soft-magnetic planar films. 36,37 Here, the magnetic anisotropy is due to the shape anisotropy of the elongated cap. The angle dependence of the normalized coercive field reads…”

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confidence: 99%

Magnetically Capped Rolled-up Nanomembranes

et al. 2012

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“…(10). Actually, it has been found (30) in Permalloy films that T becomes field-independent for max H > Hk, so that the use of extremely high fields seems unnecessary.…”

Section: Determination Of Hkmentioning

confidence: 99%

“…However, it is now known (28)(29)(30) that the coherent-rotation theory applied to films is very often inadequate. Although the discrepancies between the theory and the observed behavior appear to decrease in proportion to the angle between the applied field and the hard axis, it nevertheless seems appropriate to investigate experimentally the relationship between Hk and K.…”

Section: B) Determination Of the Anisotropy In Thin Permalloy Filmsmentioning

confidence: 99%