Stacey's theory of thermally activated magnetic domain wall motion

Magnetic wall motion is expected to keep below a maximum velocity, about 800 m/s for NiFe films (1). However, previous measurements on extraordinary viscous (2) wall motion (3), did not reveal any maximum velocity. This paper reports on vestigations extending to higher fields than in (3).The wall velocity v in uniaxial 83 at % NiFe films was determined as a function of easy axis magnetic field H and temperature. The field pulse method was used and the wall displacements were detected by electron microscopy within the range of extraordinary viscosity (4... 30 K).The field pulses were generated by a Helmholtz coil (fig. 1) energized by the discharge of a coaxial cable via a pulse shaping spark gap. Rectangular pulses up to 25 kA/m and of widths 10 ns... 3 us with rise/decay time below 15 ns were attained. For cooling the specimen down to 4 K and to minimize distortions of the field due to eddy currents, the specimen holder was a single crystal sapphire, gripped by a high-purity copper holder outside the magnetic field and mounted in a liquid He cooling stage for TEM.

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Thermally activated domain-wall motion in ferromagnetic single crystals

Siemers

Nembach

1979

Journal of Applied Physics

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For picture-frame-type single-crystal specimens of the ferromagnetic nickel-base alloy PE 16, the dependence of the domain wall velocity v on the applied magnetic field H and on temperature T has been experimentally investigated for 1.7<T<5 K. The results are interpreted by assuming that the domain wall can overcome the interaction with obstacles present in the specimen by thermal activation. Interaction potentials, which have been in common use for such problems, e.g., triangular ones, failed to give agreement between theory and experiment. Therefore a formalism has been developed, by which information on the interaction force, F (x), between the obstacle and the domain wall can directly be obtained from the experimental data. By using F (x), a relation H (v,T) can be reconstructed which is in perfect agreement with the experimental results. The obstalces, which interact with the domain wall, are probably single atoms or small clusters.

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Stacey's theory of thermally activated magnetic domain wall motion

Cited by 4 publications

References 4 publications

Thermally activated Bloch wall motion

Thermally activated Bloch wall motion

Pulse switching of magnetic films at low temperatures

Thermally activated domain-wall motion in ferromagnetic single crystals

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