Abstract
Charged magnetic domain walls have been visualized in soft magnetic nanostructured Fe thin films under both static and dynamic conditions. A transition in the core of these zigzagged magnetic walls from Néel-type to Bloch-type through the formation of crosstie walls has been observed. This transition in charged zigzagged walls was not previously shown experimentally in Fe thin films. For film thicknesses t < 30 nm, Néel-type cores are present, while at t ≈ 33 nm, walls with crosstie cores are observed. At t > 60 nm, Bloch-type cores are observed. Along with the visualization of these critical parameters, the dependence on the film thickness of the characteristic angle and length of the segments of the zigzagged walls has been observed and analyzed. After measuring the bistable magneto-optical behavior, the values of the wall nucleation magnetic field and the surface roughness of the films, an energetic fit to these nucleation values is presented.
Highlights
Magnetic thin films have long been a subject of study from both fundamental and applied points of view because of the special properties that make them appropriate for numerous technical devices, including sensors and actuators [1,2]
In this work we present a study of zigzag charged magnetic domain walls in nanostructured soft magnetic Fe thin films
The last term is thickness dependent, so the wall structure depends on the film thickness
Summary
Magnetic thin films have long been a subject of study from both fundamental and applied points of view because of the special properties that make them appropriate for numerous technical devices, including sensors and actuators [1,2]. Fe and Fe-based films are attractive for these purposes because of their high saturation magnetization at room temperature, high magnetostriction, and controllable magnetic anisotropy through the appropriate selection of deposition techniques and conditions, such as growth temperature, type of substrate, underlayer, capping layer, incident plasma angle, and thickness [3,4,5,6]. These parameters allow researchers to control certain properties, such as interfacial diffusion [7], interface roughness [8], and possible strain due to lattice mismatch between films and substrates [9], all of them having a noticeable influence on the magnetic properties. Comprehensive knowledge of the magnetic domain structures is necessary
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