Abstract
This study investigated the magnetic domain walls in a single-layer soft magnetic film with strong magnetocrystalline anisotropy energy. The soft magnetic film is composed of a highly c-axis-oriented hcp-Co81Ir19 alloy with strong negative magnetocrystalline anisotropy. The domain structure of the soft Co81Ir19 films with thickness ranging from 50–230 nm in a demagnetization state was observed through magnetic force microscopy and Lorentz transmission electron microscopy. Results reveal that the critical transition thickness at which the domain wall changes from Néel type to Bloch type is about 138 nm, which is much larger than the critical value of traditional Fe- and Co-based soft magnetic films with negligible magnetocrystalline anisotropy. Theoretical calculation was also performed and the calculated result agrees well with experimental data.
Highlights
This study investigated the magnetic domain walls in a single-layer soft magnetic film with strong magnetocrystalline anisotropy energy
Results reveal that the critical transition thickness at which the domain wall changes from Néel type to Bloch type is about 138 nm, which is much larger than the critical value of traditional Fe- and Co-based soft magnetic films with negligible magnetocrystalline anisotropy
The domain wall assumes the form of Néel wall when the film is thin and it will become Bloch wall when the film thickness exceeds a critical value
Summary
Néel wall in soft magnetic film by introducing strong magnetocrystalline anisotropy received:30June2015 accepted: 30 December 2015. The existence of Bloch wall in a soft magnetic underlayer causes the appearance of an out-of-plane stray field. Making sure that the magnetic moments strictly lie in the plane and maintaining the Néel wall in thicker soft magnetic films are important for present and potential applications. To accomplish these initiatives, researchers contributed greatly in this field. If a film composed of the hcp CoIr grains growing with the c crystal plane parallel to the film plane is prepared, the soft magnetic film with strong magnetocrystalline anisotropy energy can be achieved. The critical transition thickness from Néel wall to Bloch wall was thoroughly investigated in the oriented Co81Ir19 soft magnetic film through experimental observations
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