Anhui Key Laboratory of Spintronic and Nano Materials Research

Suzhou, China

Anhui Key Laboratory of Spintronic and Nano Materials Research

Suzhou, China
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Wang G.,Anhui Key Laboratory of Spintronic and Nano Materials Research | Wang G.,Suzhou University | Tang Y.,Anhui Key Laboratory of Spintronic and Nano Materials Research | Tang Y.,Suzhou University | And 6 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2014

The polycrystalline samples of Y1-xDyxCrO3(x=0, 0.1) were prepared by the solid-state reaction method, and the structures of samples were analyzed by X-ray diffraction (XRD) pattern. The effect of Dy3+ substitution for Y3+ on the magnetic properties of Y1-xDyxCrO3 system was researched through the measurements of the magnetization-temperature (M-T) curves and the magnetization-magnetic field(M-H) curves. The results showed that the effect of Dy3+ substitution for Y3+ on the magnetic properties of Y1-xDyxCrO3 system was strong. The sample of YCrO3 showed a canted antiferromagnetism when T was below the Neer temperature TN=139 K, which was weak ferromagnetism. For the sample of Y0.9Dy0.1CrO3 with Dy3+ substitution for Y3+ in the temperature range from 50 to 142 K, a small amount of Dy3+ was reverse direction along the infield caused by canted antiferromagnetism between two adjacent Cr3+, resulting in the decrease of ferromagnetism. In the temperature range of T<50 K, a coupling was found between ferromagnetic layer of Dy3+-O2--Dy3+ and ferromagnetic layer of Cr3+-O2--Cr3+, which led to the increase of ferromagnetism.

Wang G.-Y.,Anhui Key Laboratory of Spintronic and Nano materials Research | Wang G.-Y.,Suzhou University | Tang Y.-G.,Anhui Key Laboratory of Spintronic and Nano materials Research | Tang Y.-G.,Suzhou University | And 4 more authors.
Rare Metals | Year: 2013

The samples of La8/9Sr1/45Na4/45MnO 3 (LSNMO)/ $$\frac{x}{2}$$ (Sb 2O3) were prepared by the solid-state reaction method. The electric transport properties and the temperature stability of magnetoresistance (MR) of the samples were studied through the measurements of X-ray diffraction patterns, resistivity-temperature (ρ-T) curves, mass magnetization-temperature (σ- T) curves, and magnetoresistance-temperature (MR-T) curves. The results indicate that the ρ-T curves of the original material LSNMO show two peaks, and the phenomenon of two peaks of ρ-T curves disappears for the composite samples, which can be explained by a competition between surface-phase resistivity induced by boundary-dependent scattering and body-phase resistivity induced by paramagnetism-ferromagnetism transition. For all the samples in the low temperature range, MR increases continuously with the decrease of temperature, which shows a characteristic of low-field magnetoresistance. However, MR basically keeps the same in the high temperature range. The paramagnetism-ferromagnetism transition is observed in the high temperature range due to a composite between perovskite manganite and insulator, which can enhance the temperature of MR appearance in the high temperature range and make it to appear near room temperature. For the sample with x = 0.12, MR remains constant at the value of 7.5 % in the temperature range of 300-260 K, which achieves a temperature stability of MR near room temperature. In addition, for the sample with x = 0.16, MR is above 6.8 % in the high temperature range of 318-252 K (â̂†T = 66 K). MR almost remains constant in this temperature range, which favors the practical application of MR. © 2013 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.