Wall Streaming in Ferromagnetic Thin Films

Stein, K. U.; Feldtkeller, E.

doi:10.1063/1.1709138

Cited by 35 publications

(4 citation statements)

References 17 publications

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“…It indicates that the wall thickness must be in the order of 30 to 60 nm for the usual a = 0.01 t o 0.02. This value agrees with theoretical wall thicknesses for 140 nm thick films (cf., for instance, [15]) and lies also within the limits resulting from Lorentz microscopic wall thickness measurements quoted in [8].…”

Section: Comparison With Experimentssupporting

confidence: 85%

Magnetic Domain Wall Dynamics

Feldtkeller

1968

Physica Status Solidi (b)

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Some calculations exist for the mobility and the effective mass of ferromagnetic domain walls of special wall structures. More generally valid derivations and formulas are presented here, which are not restricted to a special wall structure. It is shown that the nonlinearity observed by several authors in the dependence of the wall velocity on the field can be predicted theoretically if the material inhomogeneities causing the coercivity are taken into account in an appropriate manner. For a special example the existence of the wall contraction and the velocity limit shown by Enz for a wall without damping and without field is shown for a wall with damping and with field. As is the approximation by Enz, the present approximation also is not able to indicate the value of this velocity limit.Fur die Beweglichkeit und die effektive Masse ferromagnetischer DomiinenwLnde sind einige Berechnungen fur spezielle Wandstrukturbeispiele bekannt geworden. Die hier wiedergegebene Rechnung ist allgemeingiiltiger und bezieht sich nicht auf eine bestimmte Wandstruktur. Es wird gezeigt, daB die verschiedentlich beobachtete Nichtlinearitiit in der AbhLngigkeit der Wandgeschwindigkeit vom angelegten Feld theoretisch zu erwarten ist, wenn man die die Koerzitivfeldstirke bestimmenden Inhomogenititen des Materials in geeigneter Weise beriicksichtigt. An einem speziellen Beispiel wird aul3erdem gezeigt, daB die von Enz fiir eine ungediimpfte Wand ohne Feld berechnete Wandkontraktion und Maximalgeschwindigkeit auch fur eine gedimpfte Wand im Feld existiert. Beide Niherungen sind jedoch nicht in der Lage, die Hohe der Grenzgeschwindigkeit sicher anzugeben.

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Section: Comparison With Experimentssupporting

confidence: 85%

Magnetic Domain Wall Dynamics

Feldtkeller

1968

Physica Status Solidi (b)

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“…According to a model used to describe DWs, the acceleration and deceleration times of a DW are defined by the same material parameters that include the Gilbert damping constant, saturation magnetization and the dimension of the magnetic wire. The acceleration and deceleration times of a DW have been found to be the same when the DW is driven by current6 via the spin transfer torque (STT) or by magnetic field78. Under such circumstances the distance a DW travels scales with the pulse length.…”

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Tunable inertia of chiral magnetic domain walls

Torrejón¹,

Martínez²,

Hayashi³

2016

Nat Commun

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The time it takes to accelerate an object from zero to a given velocity depends on the applied force and the environment. If the force ceases, it takes exactly the same time to completely decelerate. A magnetic domain wall is a topological object that has been observed to follow this behaviour. Here we show that acceleration and deceleration times of chiral Neel walls driven by current are different in a system with low damping and moderate Dzyaloshinskii–Moriya exchange constant. The time needed to accelerate a domain wall with current via the spin Hall torque is much faster than the time it needs to decelerate once the current is turned off. The deceleration time is defined by the Dzyaloshinskii–Moriya exchange constant whereas the acceleration time depends on the spin Hall torque, enabling tunable inertia of chiral domain walls. Such unique feature of chiral domain walls can be utilized to move and position domain walls with lower current, key to the development of storage class memory devices.

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“…Under pulsed field, however, another type of DW motion has been documented, known as streaming or gyromagnetic [19], overshoot or automotion [20], depending on the field direction. The common ingredient to these situations is that certain changes of the wall structure lead to a wall displacement.…”

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Magnetic domain walls displacement: Automotion versus spin-transfer torque

et al. 2010

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The magnetization dynamics equation predicts that a domain wall that changes structure should undergo a displacement by itself -automotion -due to the relaxation of the linear momentum that is associated with the wall structure. We experimentally demonstrate this effect in soft nanostrips, transforming under spin transfer torque a metastable asymmetric transverse wall into a vortex wall. Displacements more than three times as large as under spin transfer torque only are measured for 1 ns pulses. The results are explained by analytical and numerical micromagnetics. Their relevance to domain wall motion under spin transfer torque is emphasized.

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Wall Streaming in Ferromagnetic Thin Films

Cited by 35 publications

References 17 publications

Magnetic Domain Wall Dynamics

Magnetic Domain Wall Dynamics

Tunable inertia of chiral magnetic domain walls

Magnetic domain walls displacement: Automotion versus spin-transfer torque

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