Bloch Wall Motion in Ferromagnetic Films Excited by Fast-Rising Hard-Axis Pulses
- 1 March 1969
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 40 (3) , 1220-1222
- https://doi.org/10.1063/1.1657598
Abstract
Bloch wall motion along the hard direction of Permalloy films due to fast‐rising hard‐axis pulses is studied. Experimentally, it is found that for a given value of ḣ⊥, the time rate of change of the applied field, wall motion occurs only for fields in excess of a certain minimum or threshold value hth. Two distinct regions exist in this characteristic threshold curve. When ḣ⊥ is large hth is constant and when ḣ⊥ is small hth is a linear function of ḣ⊥. Above hth the wall displacement or movement per pulse increases linearly with driving field until this field approaches the value where the effect of Néel lines becomes important. A theoretical model taking account of both Bloch‐Néel wall transitions and the gyromagnetic effect of the spins in the walls and in the surrounding domains is proposed to account for the experimental results. The calculation assumes a reasonable wall structure and that Bloch walls are allowed to move freely except for a coercive force, i.e., a possibly more complicated interaction between the Bloch walls and Néel lines is neglected. With appropriate values of the constants and film parameters, the computation gives very good agreement with experimental results.This publication has 4 references indexed in Scilit:
- Wall Streaming in Ferromagnetic Thin FilmsJournal of Applied Physics, 1967
- Worm motion of domain walls in permalloy filmsIEEE Transactions on Magnetics, 1967
- Domain Wall Creeping in Thin Permalloy Films [Letter to the Editor]IBM Journal of Research and Development, 1962
- Static and Dynamic Behavior of Thin Permalloy FilmsJournal of Applied Physics, 1958