Formation mechanisms of magnetic bubbles in an M-type hexaferrite: the role of chirality reversals at domain walls

Abstract

We examined the formation mechanisms of magnetic bubbles in an M-type hexaferrite via Lorentz microscopy. When magnetic fields were perpendicularly applied to a thin sample of BaFe${}_{12-x-0.05}$Sc${}_x$Mg${}_{0.05}$O${}_{19}$ ($x=1.6$), Bloch lines, which were identified as reversals of domain-wall chirality, appeared, and magnetic bubbles were formed when the magnetic stripes were pinched off at these Bloch lines. The number of Bloch lines increased with the amount of Sc in BaFe${}_{12-x-0.05}$Sc${}_x$Mg${}_{0.05}$O${}_{19}$ probably because of the reduction in magnetic anisotropy. A Lorentz microscopic observation revealed that Bloch lines with high magnetostatic energy may play an important role in the formation of magnetic bubbles.

References in corpus (2)

• Lorentz microscopy and small-angle electron diffraction study of magnetic textures in La${}_{1-x}$Sr${}_x$MnO${}_3$ (0.15 $<x<$ 0.30): the role of magnetic anisotropy
• Foucault imaging and small-angle electron diffraction in controlled external magnetic fields

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• Magnetic textures in a hexaferrite thin film and their response to magnetic fields revealed by phase microscopy
• Microscopic magnetization distribution of Bloch lines in a uniaxial magnet
• Observation of magnetic domains in uniaxial magnets via small-angle electron diffraction and Foucault imaging
• Two types of magnetic bubbles in MnNiGa observed via Lorentz microscopy