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Journal Articles

Magnetization reversal in TmCrO$$_{3}$$

Yoshii, Kenji

Materials Research Bulletin, 47(11), p.3243 - 3248, 2012/11

https://doi.org/10.1016/j.materresbull.2012.08.005
 Times Cited Count：88 Percentile：90.1(Materials Science, Multidisciplinary)

The perovskite chromite TmCrO$$_{3}$$ shows magnetization reversal at two temperatures. The reversal at $$sim$$28 K is attributed to the antiparallel coupling between Tm$$^{3+}$$ and Cr$$^{3+}$$ moments, while that at the lower temperature ($$sim$$6-7 K) is rooted in a rotation of the magnetic moments. Magnetocaloric measurements offer a relatively large entropy change ($$sim$$4-5 Jkg$$^{-1}$$ K$$^{-1}$$) at the lower temperature. The reversal at $$sim$$28 K is accompanied by a sign change of an exchange-bias-like field. The absence of the training effect suggests that this behavior is rooted in unidirectional magnetic anisotropy. The existence of the two magnetization reversals offers the characteristic switching of magnetization. For example, the magnetization is flipped without changing the direction of the applied magnetic field.

Journal Articles

Magnetic and dielectric study of R$$_{0.5}$$Sr$$_{0.5}$$MnO$$_{3}$$ (R = Gd, Tb and Dy)

Yoshii, Kenji; Hiramitsu, Yusuke*; Okajima, Yuka*; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Junichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu*; Morii, Yukio; et al.

Materials Research Bulletin, 45(11), p.1574 - 1580, 2010/10

https://doi.org/10.1016/j.materresbull.2010.07.024
 Times Cited Count：12 Percentile：37.13(Materials Science, Multidisciplinary)

Magnetic and dielectric properties of perovskite manganites R$$_{0.5}$$Sr$$_{0.5}$$MnO$$_{3}$$ (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg about 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R$$^{3+}$$ and Sr$$^{3+}$$ settled randomly at the same crystallographic site. Dielectric constants for each material were about 1000-10000 between about 50 K and 300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this system are governed by the randomness at the R/Sr site. The tan$$delta$$ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

Journal Articles

Magnetism and transport of ${it Ln}$$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$(${it Ln}$=Pr, Nd, Sm and Eu)

Yoshii, Kenji; Abe, Hideki*; Nakamura, Akio

Materials Research Bulletin, 36(7-8), p.1447 - 1454, 2001/06

https://doi.org/10.1016/S0025-5408(01)00605-5
 Times Cited Count：41 Percentile：78.98(Materials Science, Multidisciplinary)

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