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3 Jul 2000

Volume 77, Issue 1, pp. 1-153

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Grain-boundary effects on the electrical resistivity and the ferromagnetic transition temperature of La0.8Ca0.2MnO3

Yonglai Fu

Appl. Phys. Lett. 77, 118 (2000); http://dx.doi.org/10.1063/1.126908 (3 pages) | Cited 33 times

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In this letter, grain-boundary effects on the electrical transport and the ferromagnetic transition temperature were investigated in La0.8Ca0.2MnO3. The different ferromagnetic transition temperature (45 K) and the different metal–semiconductor transition temperature (62 K) were observed in the samples with different grain boundaries. Wide grain boundaries can induce large grain-boundary effects on grain, and small grain size also induces large grain-boundary effects on grain due to the increase of grain boundaries. The possible mechanism of grain-boundary effect is explained as the strain effect of grain induced by the distortion at grain boundaries. The strain of grains should enhance the ferromagnetic double exchange interaction. © 2000 American Institute of Physics.
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75.50.Dd Nonmetallic ferromagnetic materials
61.72.Mm Grain and twin boundaries
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
71.30.+h Metal-insulator transitions and other electronic transitions
72.60.+g Mixed conductivity and conductivity transitions
75.30.Et Exchange and superexchange interactions

Asymmetrical magnetoimpedance in as-cast CoFeSiB amorphous wires due to ac bias

D. P. Makhnovskiy, L. V. Panina, and D. J. Mapps

Appl. Phys. Lett. 77, 121 (2000); http://dx.doi.org/10.1063/1.126896 (3 pages) | Cited 15 times

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Asymmetrical giant magnetoimpedance (AGMI), which utilizes a high frequency bias field hb, is realized in a Co-based amorphous wire having a circumferential anisotropy in the outer region. No asymmetry in the dc magnetic configuration is needed in this case. AGMI is discussed in terms of the surface impedance tensor, demonstrating that the effect of hb is related to the role of the off-diagonal component of the impedance in the voltage response measured across the wire. This effect is important for developing autobiased linear magnetic sensors. Using two oppositely biased wires, a near-linear voltage output (±4 mV) is obtained in the range of ±5 Oe for the sensed dc field at a frequency of 8 MHz. © 2000 American Institute of Physics.
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75.50.Kj Amorphous and quasicrystalline magnetic materials
72.15.Gd Galvanomagnetic and other magnetotransport effects
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.55.-w Magnetic instruments and components
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