138 citations · 397 across the 14 of their papers we have counts for
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Two types of magnetic bubbles in MnNiGa observed via Lorentz microscopy
Hiroshi Nakajima, Atsuhiro Kotani, Ken Harada +1
Magnetic bubbles are remarkable spin structures that developed in uniaxial magnets with strong magnetocrystalline anisotropy. Several contradictory reports have been published conc…
Magnetic textures in a hexaferrite thin film and their response to magnetic fields revealed by phase microscopy
Atsuhiro Kotani, Ken Harada, Marek Malac +3
We investigated magnetic textures in a Sc-doped hexaferrite film by means of phase microscopy (PM) with a hole-free phase plate in a transmission electron microscope. In a zero mag…
Magnetic bubbles in an M-type hexagonal ferrite observed by hollow-cone Foucault imaging and small-angle electron diffraction
Atsuhiro Kotani, Hiroshi Nakajima, Atsushi Kawaguchi +5
We report hollow-cone imaging and small-angle electron diffraction of nanoscale magnetic textures such as magnetic-striped domains and magnetic bubbles of M-type hexagonal ferrite…
Formation mechanisms of magnetic bubbles in an M-type hexaferrite: the role of chirality reversals at domain walls
H. Nakajima, A. Kotani, K. Harada +2
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…
Foucault imaging and small-angle electron diffraction in controlled external magnetic fields
Hiroshi Nakajima, Atsuhiro Kotani, Ken Harada +2
We report a method for acquiring Foucault images and small-angle electron diffraction patterns in external magnetic fields using a conventional transmission electron microscope wit…
Electron diffraction covering a wide angular range from Bragg diffraction to small-angle diffraction
Hiroshi Nakajima, Atsuhiro Kotani, Ken Harada +1
We construct an electron optical system to investigate Bragg diffraction (the crystal lattice plane, - rad) with the objective lens turned off by adjusting the cu…