Magnetic Contrast and Inclined 90° Domain Walls in Thick Iron Films

概要

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A new structure of the magnetic 90° wall has been found in epitaxially grown (001) iron films with a thickness from 2000Å to 7000Å using a 1000kV electron microscope. The 90° walls were observed as the images of different line widths and contrasts in Lorentz microscopy. The differences in line width and contrast appear in a selected area of a sample film and frequently along a 90° wall. From experiments of the Lorentz microscopy and deflection pattern using a sample tilting system, it is concluded that the 90° wall plane is inclined by different angles less than 45° from the film normal. A two-dimensional model of 90° wall is proposed and the wall energy E of the inclined wall is calculated. E has a broad minimum with respect to the inclination angle Δ; E=4.0 erg/cm^2 at 14°<Δ<35° and =4.6 erg/cm^2 at Δ=0° and =52° for the 4000Å iron film.
社団法人日本物理学会の論文
1972-01-05