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2 Mar 1998

Volume 72, Issue 9, pp. 1001-1123

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Microstructure and hard magnetic properties of nanocomposite Sm2Fe15Ga2Cx permanent magnets with an excess of Fe prepared directly by melt spinning

Zhao-hua Cheng, Jun-xian Zhang, Hui-qun Guo, J. van Lier, H. Kronmüller, and Bao-gen Shen

Appl. Phys. Lett. 72, 1110 (1998); http://dx.doi.org/10.1063/1.120939 (3 pages) | Cited 13 times

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The nanocomposites Sm–Fe–Ga–C with low Sm contents have been prepared directly by melt spinning without a subsequent heat treatment. A highly isotropic remanence to saturation magnetization ratio of 0.6–0.7 and a relatively high coercivity of 5.5 kOe were achieved from the as-quenched ribbons. X-ray diffraction and thermomagnetic analyses show that the as-quenched ribbons consist of a magnetically hard phase Sm2Fe15Ga2Cx and a magnetically soft phase α-Fe. Transmission electron microscopy observation demonstrates that the major 2:17-type phase has larger crystallites and the crystallites of the minor phase α-Fe are smaller and located separately at the grain boundaries of the major phase. The remanence enhancement is attributed to the exchange coupling between the intergrains. Both microstructure and magnetic properties are found to depend sensitively on the substrate velocity. The effect of the microstructure on hard magnetic properties has been discussed. © 1998 American Institute of Physics.
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75.50.Bb Fe and its alloys
75.50.Ww Permanent magnets
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Vv High coercivity materials
75.50.Kj Amorphous and quasicrystalline magnetic materials
81.07.-b Nanoscale materials and structures: fabrication and characterization
81.40.Gh Other heat and thermomechanical treatments
72.15.Jf Thermoelectric and thermomagnetic effects
81.40.Rs Electrical and magnetic properties related to treatment conditions
75.30.Cr Saturation moments and magnetic susceptibilities

In-plane grain boundary effects on the magnetotransport properties of La0.7Sr0.3MnO3−δ

J. Y. Gu, S. B. Ogale, M. Rajeswari, T. Venkatesan, R. Ramesh, V. Radmilovic, U. Dahmen, G. Thomas, and T. W. Noh

Appl. Phys. Lett. 72, 1113 (1998); http://dx.doi.org/10.1063/1.120940 (3 pages) | Cited 47 times

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C-axis oriented La0.7Sr0.3MnO3−δ (LSMO) films were fabricated on the top of SrTiO3/YBa2Cu3O7 grown on MgO (001) substrates. From x-ray ϕ-scan and planar transmission electron microscopy measurements, the LSMO layer in the LSMO/SrTiO3/YBa2Cu3O7/MgO heterostructure is found to have coherent in-plane grain boundaries with a predominance of 45° rotations (between [100] and [110] grains) in addition to the cube-on-cube epitaxial relationship. Also, epitaxial LSMO/Bi4Ti3O12/LaAlO3 (001) and c-axis textured LSMO/Bi4Ti3O12/SiO2/Si (001) with random in-plane grain boundaries are introduced as the counterparts for comparison. The resistivity and magnetoresistance (MR) of LSMO layer were measured and compared. The low field MR at low temperature shows a dramatic dependence on the nature of the grain boundary. An attempt is made to interpret these results on the basis of correlation between the magnetic properties and grain structures. © 1998 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
75.47.De Giant magnetoresistance
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
61.72.Mm Grain and twin boundaries

Magnetization reversal in submicron magnetic wire studied by using giant magnetoresistance effect

T. Ono, H. Miyajima, K. Shigeto, and T. Shinjo

Appl. Phys. Lett. 72, 1116 (1998); http://dx.doi.org/10.1063/1.120941 (2 pages) | Cited 43 times

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The magnetization reversal phenomenon in a submicron magnetic wire with a trilayer structure consisting of NiFe(200 Å)/Cu(100 Å)/NiFe(50 Å) was investigated by measuring the electric resistance in an external magnetic field. A giant magnetoresistance (GMR) effect of about 0.8% was observed when the magnetizations in two NiFe layers are oriented antiparallel. It is demonstrated that magnetization reversal phenomena can be very sensitively investigated by utilizing the GMR effect. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.47.De Giant magnetoresistance
73.61.At Metal and metallic alloys

Nanoparticle morphology in a granular Cu–Co alloy with giant magnetoresistance

Wendong Wang, Fengwu Zhu, Jun Weng, Jimei Xiao, and Wuyan Lai

Appl. Phys. Lett. 72, 1118 (1998); http://dx.doi.org/10.1063/1.120942 (3 pages) | Cited 25 times

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The morphology of nanometer-sized cobalt granules in a granular Cu88Co12 alloy was directly determined utilizing an atom probe-field ion microscope. The granules are spherical in shape, and exhibit a size distribution. Giant magnetoresistance (GMR) was observed in alloys with an average granule size ranging from 1.5 to 6 nm in diameter. A well-known theoretical model of general GMR behavior in magnetic granular systems was confirmed based on measurement of size distribution of the granules. © 1998 American Institute of Physics.
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75.50.Cc Other ferromagnetic metals and alloys
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Tt Fine-particle systems; nanocrystalline materials
75.47.De Giant magnetoresistance
61.46.-w Structure of nanoscale materials
72.15.Gd Galvanomagnetic and other magnetotransport effects
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