Abstract
We have investigated topological spin textures in the ferromagnetic metallic phase of La0.825Sr0.175MnO3 with the centrosymmetric crystal structure by small-angle electron diffraction (SmAED) and low-temperature Lorentz transmission electron microscopy (TEM) experiments. In-situ Lorentz TEM and SmAED experiments revealed that type-I and type-II magnetic bubbles evolved from magnetic stripe domains with the Bloch-type domain wall by applying vertical magnetic field. Type-I magnetic bubbles with left-handed and right-handed spin helicity were randomly distributed and simultaneously type-II magnetic bubbles are formed locally. The important point about type-I and type-II magnetic bubbles is that their emergence depends strongly on whether perpendicular magnetic field is applied parallel to the magnetic easy axis along the [001] direction. Our experimental results suggested that the stabilization of magnetic bubbles should originate from the long-range dipole-dipole interactions, as opposed to the Dzyaloshinskii-Moriya interaction in helical magnets.
Highlights
Topological spin textures such as magnetic bubbles and magnetic skyrmion have been attracted attention in the field of magnetic materials because of their potential practical applications to new spin devices and quantum computing applications.[1,2,3,4,5] The magnetic skyrmion is characterized as a specific type of bubbles with whirling magnetic spins.[1]
Type-II magnetic bubbles and magnetic biskyrmion were found in the ferromagnetic phases of La0.875Sr0.125MnO3 with perovskite-type structure and La1.37Sr1.63Mn2O7 with layered perovskite-type structure, which belong to the crystal structures with the centrosymmetric space group.[13,14]
We have investigated magnetic spin textures in the ferromagnetic metallic phase of La0.825Sr0.175MnO3 by small-angle electron diffraction (SmAED) technique and low-temperature Lorentz transmission electron microscopy (TEM)
Summary
Topological spin textures such as magnetic bubbles and magnetic skyrmion have been attracted attention in the field of magnetic materials because of their potential practical applications to new spin devices and quantum computing applications.[1,2,3,4,5] The magnetic skyrmion is characterized as a specific type of bubbles with whirling magnetic spins.[1]. Note that magnetic easy axes in the ferromagnetic phase of La1−xSrxMnO3 for x > 0.15 are parallel to the [111] direction in the high-temperature rhombohedral structure and, on the other hand, to the [001] direction in the low-temperature orthorhombic structure.[18,19] In our previous work, Lorentz TEM observation in the ferromagnetic metallic phase of La0.825Sr0.175MnO3 revealed that magnetic stripe domains with the Bloch-type magnetic domain wall appeared in the orthorhombic structure without external magnetic field (B = 0 T).[20] magnetic response of the magnetic stripe domains by applying external magnetic field has not been investigated so far. In this work we have investigated topological spin textures and their responses by applying external magnetic field perpendicular to the thin plate of La1−xSrxMnO3 for x = 0.175 by smallangle electron diffraction (SmAED) and low-temperature Lorentz transmission electron microscopic (TEM) experiments
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