New Method to Measure Directly the 180° Bloch Wall Energy
- 1 April 1963
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 34 (4) , 1321-1322
- https://doi.org/10.1063/1.1729491
Abstract
Using the Bitter technique, the traces of a single 180° Bloch wall are observed by a device composed of two microscopes, one on each side of the sample. The wall is twisted by an inhomogeneous magnetic field. The measured displacements of the wall traces are related to the surface energy γ0 of the Bloch wall which in turn is related to the Heisenberg exchange constant A. In an iron‐silicon alloy with 3% Si we find γ0=1.48 ergs/cm2 and A=1.48×10−6 ergs/cm at room temperature, in fair agreement with the value A∼1.7×10−6 ergs/cm derived from Bloch's law and spin‐wave theory at 0°K.This publication has 3 references indexed in Scilit:
- Direct Measurement of Domain Wall EnergyProceedings of the Physical Society, 1959
- Physical Theory of Ferromagnetic DomainsReviews of Modern Physics, 1949
- A Simple Domain Structure in an Iron Crystal Showing a Direct Correlation with the MagnetizationPhysical Review B, 1949