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9 Feb 1998

Volume 72, Issue 6, pp. 627-747

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Magnetoresistance of magnetite

J. M. D. Coey, A. E. Berkowitz, Ll. Balcells, F. F. Putris, and F. T. Parker

Appl. Phys. Lett. 72, 734 (1998); http://dx.doi.org/10.1063/1.120859 (3 pages) | Cited 181 times

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The magnetoresistance behavior of Fe3O4 in polycrystalline thin film, powder compact, and single-crystal form are compared. Negative magnetoresistance with peaks at the coercive field, observed in thin films and powder compacts but not in the single crystal, is due to field-induced alignment of the magnetization of contiguous grains. The effect is associated with intergranular transport of spin-polarized electrons. © 1998 American Institute of Physics.
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72.20.My Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)

Oscillatory perpendicular magnetic anisotropy and lattice plane spacing in Fe/Au superlattices

K. Takanashi, S. Mitani, K. Himi, and H. Fujimori

Appl. Phys. Lett. 72, 737 (1998); http://dx.doi.org/10.1063/1.120860 (3 pages) | Cited 29 times

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Perpendicular magnetic anisotropy has been investigated for Fe(x ML)/Au(x ML) superlattices (ML: monatomic layer thickness) with x ranging from 1 to 4. The x-ray diffraction analyses indicate the formation of coherent layered structures both for x = integers and nonintegers. However, the perpendicular magnetic anisotropy for x = nonintegers shows different behavior from that for x = integers, and consequently, it oscillates as a function of x with a period of 1 ML. Furthermore, the out-of-plane lattice spacing also oscillates in the same manner. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Bb Fe and its alloys
75.30.Gw Magnetic anisotropy
68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties

Anisotropic transport properties of single-crystal (La,Ca)MnOδ thin films

X. T. Zeng and H. K. Wong

Appl. Phys. Lett. 72, 740 (1998); http://dx.doi.org/10.1063/1.120861 (2 pages) | Cited 7 times

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We report on the observation of anisotropic transport properties in La2/3Ca1/3MnOδ that has a nearly cubic perovskite structure. We prepared single-crystal La2/3Ca1/3MnOδ thin films with a-axis orientation. It is found that the resistivity and magnetoresistance of the samples annealed in oxygen at 920 °C for 1 h are higher along the c-axis direction than along the a-axis direction by about 34%–37% near the metal–semiconductor transition temperature. Further post-annealing in oxygen at 950 °C for 6 h increased the anisotropy ratio of magnetoresistance to 1.9. This indicates that the anisotropic transport properties result from additional magnetic scattering along the c-axis direction of the films. © 1998 American Institute of Physics.
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73.61.At Metal and metallic alloys
72.15.Gd Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
72.60.+g Mixed conductivity and conductivity transitions
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