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Journal Articles

Lorentz transmission electron microscopy observation of magnetic domains in La$$_{0.825}$$Sr$$_{0.175}$$(Mn,Al)O$$_{3}$$

Mori, Shigeo*; Yoshidome, Kazuhiro*; Nagamine, Yuki*; Togawa, Yoshihiko*; Yoshii, Kenji; Takenaka, Koshi*

Journal of Applied Physics, 107(9), p.09D306_1 - 09D306_3, 2010/05

https://doi.org/10.1063/1.3358225
 Times Cited Count：0 Percentile：0(Physics, Applied)

Nonmagnetic Al substitution effect on the stability of a ferromagnetic (FM) metallic state indouble-exchange manganite, La$$_{0.825}$$Sr$$_{0.175}$$MnO$$_{3}$$, was investigated by Lorentz transmission electronmicroscopy (TEM), in combination with magnetic measurements. Both FM transition temperature(Tc) and the rhombohedral-to-orthorhombic (R-to-O) transition temperature (Ts) decreased by a few percent of Al substitution. An in situ Lorentz TEM observation revealed that drastic change of the FM domain structure took place through the R-to-O structural transition. The magnetization decreased slightly at Ts and characteristic spin-glass state is realized in the low-temperature region below Ts.

Journal Articles

Magnetic properties and ferromagnetic microstructures in Al-doped La$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$

Mori, Shigeo*; Yoshidome, Kazuhiro*; Nagamine, Yuki*; Togawa, Yoshihiko*; Yoshii, Kenji; Takenaka, Koshi*

Journal of Physics; Conference Series, 200, p.012129_1 - 012129_4, 2010/02

https://doi.org/10.1088/1742-6596/200/1/012129
 Times Cited Count：5 Percentile：84.49(Materials Science, Multidisciplinary)

Doping effect on ferromagnetic (FM) properties in perovskite manganites La$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$ (x=0.175) were investigated by low-temperature Lorentz transmission electron microscopy (TEM), in combination with the conventional magnetic measurements. It is found that La$$_{0.825}$$Sr$$_{0.175}$$Mn$$_{0.95}$$Al$$_{0.05}$$O$$_{3}$$ exhibits a structural phase transition from the rhombohedral to orthorhombic structures at Ts$$sim$$116 K. During the rhombohedral-to-orthorhombic transition, the FM domain structures changed from the macroscopic FM domains to the FM ones with the wavy stripe pattern. The ac magnetic measurements also revealed that La$$_{0.825}$$Sr$$_{0.175}$$Mn$$_{0.95}$$Al$$_{0.05}$$O$$_{3}$$ shows unconventional magnetic behaviour at low temperature below 65 K. Partial substitution of non-magnetic Al$$^{3+}$$ for Mn$$^{3+}$$ has some influence on magnetic ordering and double-exchange interaction, which should induce insulator behaviour in the orthorhombic phase.

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