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22 Mar 1999

Volume 74, Issue 12, pp. 1645-1775

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Large room-temperature intergrain magnetoresistance in double perovskite SrFe1−x(Mo or Re)xO3

T. H. Kim, M. Uehara, S-W. Cheong, and S. Lee

Appl. Phys. Lett. 74, 1737 (1999); http://dx.doi.org/10.1063/1.123672 (3 pages) | Cited 110 times

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We report significant intergrain magnetoresistance (IMR) in polycrystalline double perovskites of SrFe1−x(Mo or Re)xO3 at room temperature. Systematics of the temperature dependence of IMR indicates that the observed large room-temperature IMR in SrFe1/2Mo1/2O3 originates from the ferrimagnetic nature of insulating grain boundaries as well as the half-metallicity of this perovskite. Our results indicate that a new avenue for spin-polarized tunneling junctions is to utilize insulating interface layers with ferromagnetic or ferrimagnetic coupling. © 1999 American Institute of Physics.
Show PACS
75.47.Gk Colossal magnetoresistance
75.50.Gg Ferrimagnetics
75.30.Et Exchange and superexchange interactions
61.72.Mm Grain and twin boundaries
75.50.Dd Nonmetallic ferromagnetic materials
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

Dependence of magnetic properties on grain size of α-Fe in nanocomposite (Nd, Dy)(Fe, Co, Nb, B)5.5/α-Fe magnets

X. K. Sun, Jian Zhang, Yelong Chu, Wei Liu, Baozhi Cui, and Zhidong Zhang

Appl. Phys. Lett. 74, 1740 (1999); http://dx.doi.org/10.1063/1.123673 (3 pages) | Cited 37 times

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For the nanocomposite magnets (Nd0.9Dy0.1)(Fe0.77Co0.12Nb0.03B0.08)5.5/α-Fe, the best magnetic properties were obtained with the average grain size of α-Fe d = 15 nm and with the content of α-Fe cm = 45 wt % that is well below the structural percolation threshold of the soft magnetic phase. The measured dependence of the coercivity on the grain size of α-Fe tends to indicate that the optimum grain size dop increases with increasing α-Fe content, for cm>30 wt %. If d>dop, contracted hysteresis is formed; if d<dop/2, the coercivity rapidly decrease due to possible coupling between hard magnetic grains situated at two sides of a soft grain. © 1999 American Institute of Physics.
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75.50.Ww Permanent magnets
75.50.Kj Amorphous and quasicrystalline magnetic materials
81.40.Rs Electrical and magnetic properties related to treatment conditions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.07.-b Nanoscale materials and structures: fabrication and characterization
75.50.Vv High coercivity materials
75.50.Bb Fe and its alloys

Epitaxial growth of magnetoresistive (00h), (0hh), and (hhh) La2/3Sr1/3MnO3 thin films on (001)Si substrates

J. Fontcuberta, M. Bibes, B. Martínez, V. Trtik, C. Ferrater, F. Sánchez, and M. Varela

Appl. Phys. Lett. 74, 1743 (1999); http://dx.doi.org/10.1063/1.123674 (3 pages) | Cited 10 times

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We show that suitable choice of the buffer heterostructure allows us to obtain epitaxial (00h), (0hh), and (hhh) La2/3Sr1/3MnO3 thin films on buffered Si(001) substrates. The magnetotransport properties are investigated. Irrespective of the film texture, it is found that the easy-magnetization direction lies within the film plane. The low-field magnetoresistance is mainly controlled by the in-plane misorientation of crystallites while differences associated with the distinct microstructure of the interfaces appear to have only a second-order effect. © 1999 American Institute of Physics.
Show PACS
81.15.Fg Pulsed laser ablation deposition
68.55.-a Thin film structure and morphology
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.50.Dd Nonmetallic ferromagnetic materials
75.70.Ak Magnetic properties of monolayers and thin films
81.15.Kk Vapor phase epitaxy; growth from vapor phase
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Single crystal superconductor nanowires by electrodeposition

Ge Yi and Walther Schwarzacher

Appl. Phys. Lett. 74, 1746 (1999); http://dx.doi.org/10.1063/1.123675 (3 pages) | Cited 81 times

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See Also: Erratum

Show Abstract
Superconducting Pb wires (diameter ∼ 50 nm) have been prepared by pulse electrodeposition in nanoporous membranes. Single crystal or polycrystalline nanowires may be grown selectively and reproducibly depending on the pulse parameters. Unexpectedly, the growth of single crystal wires requires a greater departure from equilibrium conditions (greater overpotential) than the growth of polycrystalline ones. The importance of controlling the crystal texture is demonstrated by measurements of the superconducting transition temperature Tc which give significantly different results for polycrystalline and single crystal nanowires. © 1999 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
81.15.Pq Electrodeposition, electroplating
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
81.07.-b Nanoscale materials and structures: fabrication and characterization
74.25.F- Transport properties
68.55.-a Thin film structure and morphology

Domain structure in Fe-implanted Nd2Fe14B magnets

Youhui Gao, Jinghan Zhu, Yuqing Weng, and Baoshan Han

Appl. Phys. Lett. 74, 1749 (1999); http://dx.doi.org/10.1063/1.123676 (3 pages) | Cited 12 times

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The surface microstructure of Nd2Fe14B magnets was modified by Fe ion implantation. Their domain structures were studied by magnetic force microscopy. Corrugation and spike pattern domains were found on the (001) plane of unimplanted Nd2Fe14B. After implantation, a domain structure transition from complex maze to stripe pattern was found. The width of the stripe domain increases with increasing Fe dose. It indicates that the magnetic moments in the implanted layer turn out of their easy axis. The magnetization configurations in the implanted magnets were calculated using a micromagnetics method. The theoretical results agree well with the experimental results. © 1999 American Institute of Physics.
Show PACS
75.50.Ww Permanent magnets
75.50.Bb Fe and its alloys
75.60.Ch Domain walls and domain structure
61.80.Jh Ion radiation effects
61.72.up Other materials
75.40.Mg Numerical simulation studies
75.50.Kj Amorphous and quasicrystalline magnetic materials
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