Domain-wall velocity, mobility, and mean-free-path in permalloy films

Konishi, S.; Yamada, S.; Kusuda, T.

doi:10.1109/tmag.1971.1067097

Cited by 45 publications

(25 citation statements)

References 9 publications

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“…(5.13) and (5.14) between the origin and the data point measured at the highest field. These values were much closer to the ones previously observed in films [492] and also to the ones predicted by theory [493]. The results were regarded as a proof that the operational speed of potential spintronic devices involving DW motion in magnetic nanostructures would not be affected by structural confinement.…”

Section: Domain Wall Dynamics In 1d Metallic Nanostructuressupporting

confidence: 89%

Physical properties of elongated inorganic nanoparticles

et al. 2011

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Section: Domain Wall Dynamics In 1d Metallic Nanostructuressupporting

confidence: 89%

Physical properties of elongated inorganic nanoparticles

et al. 2011

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“…The mobility of a symmetric Bloch wall is 5 m/s.Oe close to the mobility value, 6.7 m/s Oe, measured experimentally by Konichi for a wall structure in a 67 nm thick Permalloy film. 1 However, the simulated value is half the expected theoretical mobility of 9.6 m/s Oe calculated from the theoretical mobility 6 of a moving 180°Bloch wall in an infinitely thick material. The presence of demagnetizing effects arising from the surfaces ought to slow a Bloch wall as shown by the simulation.…”

Section: Resultsmentioning

confidence: 70%

“…Three distinct values of wall mobility were found at 150, 670, and 31 nm. 1 Several simulations have shown that in this range of thickness, the wall structure is a C-shaped wall, 2,3 a symmetric Bloch wall 4 or a Néel wall, respectively. Figure 1 shows the magnetization vector in an x-z cross section normal to the wall plane (y-z) for ͑a͒ a 160-nm-thick C-shaped ͑asymmetric Bloch͒ wall and ͑b͒ an 80-nm-thick symmetric Bloch wall.…”

Section: Introductionmentioning

confidence: 98%

Thickness dependent wall mobility in thin Permalloy films

Redjdal¹,

Giusti²,

Ruane³

et al. 2002

Journal of Applied Physics

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Domain wall mobility in Permalloy films has been calculated as a function of thickness at 10, 80, and 160 nm which reflects the structure change of Néel, symmetric Bloch and C-shaped (asymmetric Bloch) domain walls. The mobility has been derived from the dynamics of a single nonperiodic domain wall using direct integration of the Landau–Lifshitz–Gilbert equation in a Cartesian lattice. This investigation allows for a detailed examination of spin precession, wall motion and overall magnetization distortion as the wall is moved in the presence of fields ranging from 0.5 to 5 Oe applied in the easy axis direction. At 10-nm-thick films, the mobility of a Néel wall is 30 m/s Oe. Wall motion takes place without noticeable distortion in the magnetization distribution in the vicinity of the Néel wall. For 80 nm-thick films, the mobility of a symmetric Bloch wall is 5 m/s Oe, or 20% less than the theoretical prediction for the mobility of a 180° domain wall model. At dynamic equilibrium, the symmetric Bloch wall has been slightly distorted into a C-shaped wall. For 160 nm-thick films, the mobility of a C-shaped wall is 12 m/s Oe, or 29% less than the theoretical predicted value. Shearing-type magnetization distortion is observed in this composite structure of a Bloch component at the center and Néel caps of opposite chirality at the surfaces.

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“…3 For Permalloy thin-films ͑compositions around Ni 80 Fe 20 ͒ the magnetization process typically involves nucleation and propagation of domain walls throughout the film. 4 The domain wall propagation velocity in Permalloy thin-films has been determined experimentally by several groups [4][5][6][7] and it was shown that the velocity increases monotonically with field and the field dependence of the wall velocity may be divided into two regimes: a high-field regime controlled by gyromagnetic damping; and a low-field regime where thermally activated depinning contributes to the propagation time. In contrast, theoretical studies 8,9 and simulations 10,11 have shown that in the absence of pinning the domain wall velocity can increase approximately linearly with field up to a critical field beyond which the domain wall structure is no longer stable; in this case both the wall structure and wall motion become complex including periods of retrograde motion which has been termed Walker breakdown.…”

Section: Introductionmentioning

confidence: 99%

Complex pulsed field magnetization behavior and Walker breakdown in a NiFe thin-film

Burn

Atkinson

2010

Journal of Applied Physics

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The magnetization behavior of a Permalloy thin-film ͑nominally Ni 81 Fe 19 ͒ was investigated as a function of combined quasistatic and pulsed magnetic fields measured using magneto-optic Kerr effect magnetometry. We observed complex field dependent switching behavior that depends on the relative contributions to the total field of the quasistatic and pulsed fields. As the pulsed field amplitude was increased, complex switching behavior occurs for total fields in excess of the coercive field. A simple phenomenological domain wall propagation model suggests a qualitative understanding of this complex behavior based on Walker breakdown of the domain wall motion occurring in the Permalloy thin-film.

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Domain-wall velocity, mobility, and mean-free-path in permalloy films

Cited by 45 publications

References 9 publications

Physical properties of elongated inorganic nanoparticles

Physical properties of elongated inorganic nanoparticles

Thickness dependent wall mobility in thin Permalloy films

Complex pulsed field magnetization behavior and Walker breakdown in a NiFe thin-film

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