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20 Jan 2003

Volume 82, Issue 3, pp. 313-483

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Appl. Phys. Lett. 82, 370 (2003); http://dx.doi.org/10.1063/1.1537514 (3 pages)

Jan Schroers, Chris Veazey, and William L. Johnson
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Magneto-optical light scattering from ferromagnetic surfaces

M. U. González, G. Armelles, C. Martínez Boubeta, and A. Cebollada

Appl. Phys. Lett. 82, 421 (2003); http://dx.doi.org/10.1063/1.1537511 (3 pages) | Cited 2 times

Online Publication Date: 15 January 2003

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We have studied the optical and magneto-optical components of the light scattered by the surface of several Fe films with different morphologies. We present a method, based on the ratio between the optical and magneto-optical components of the scattered intensity, to discern the physical origin, either structural or magnetic corrugation, of the light scattered by these ferromagnetic surfaces. Surface versus bulk magnetic information can be separated by magneto-optical light scattering measurements, the scattered light being more sensitive to magnetization differences between surface and bulk than the reflected one. © 2003 American Institute of Physics.
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78.20.Ls Magneto-optical effects
78.66.Bz Metals and metallic alloys
81.05.Bx Metals, semimetals, and alloys
75.70.Rf Surface magnetism
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Bb Fe and its alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.35.+c Brillouin and Rayleigh scattering; other light scattering
68.35.B- Structure of clean surfaces (and surface reconstruction)
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

Martensitic transformation and shape memory effect in ferromagnetic Heusler alloy Ni2FeGa

Z. H. Liu, M. Zhang, Y. T. Cui, Y. Q. Zhou, W. H. Wang, G. H. Wu, X. X. Zhang, and Gang Xiao

Appl. Phys. Lett. 82, 424 (2003); http://dx.doi.org/10.1063/1.1534612 (3 pages) | Cited 72 times

Online Publication Date: 15 January 2003

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We have synthesized ferromagnetic Heusler alloy Ni2FeGa using the melt-spinning technique. The Ni2FeGa ribbon, having a high chemical ordering L21 structure, exhibits a thermoelastic martensitic transformation from cubic to orthorhombic structure at 142 K and a premartensitic transformation. The alloy has a relatively high Curie temperature of 430 K, a magnetization of 73 Am2/kg, and a low saturated field of 0.6 T. The textured samples with preferentially oriented grains show a completely recoverable two-way shape memory effect with a strain of 0.3% upon the thermoelastic martensitic transformation. © 2003 American Institute of Physics.
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81.30.Kf Martensitic transformations
75.50.Bb Fe and its alloys
81.40.Jj Elasticity and anelasticity, stress-strain relations
75.80.+q Magnetomechanical effects, magnetostriction
62.20.F- Deformation and plasticity
81.40.Lm Deformation, plasticity, and creep
62.20.D- Elasticity
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Measurements of spin polarization of epitaxial SrRuO3 thin films

B. Nadgorny, M. S. Osofsky, D. J. Singh, G. T. Woods, R. J. Soulen, M. K. Lee, S. D. Bu, and C. B. Eom

Appl. Phys. Lett. 82, 427 (2003); http://dx.doi.org/10.1063/1.1539551 (3 pages) | Cited 23 times

Online Publication Date: 15 January 2003

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We have measured the transport spin polarization of epitaxial thin films of the conductive ferromagnetic oxide, SrRuO3, using point contact Andreev reflection spectroscopy. In spite of the fact that spin-up and spin-down electronic densities of states at the Fermi level for SrRuO3 calculated from band structure theory are practically the same, the experimental transport spin polarization for these films was found to be about 50%. This is a direct consequence of the Fermi velocity disparity between the majority and minority bands. The experimental results are compared with our theoretical estimates of the spin polarization in the ballistic and diffusive limits. © 2003 American Institute of Physics.
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75.47.Pq Other materials
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials
75.10.Lp Band and itinerant models

Magnetoresistance and switching of electrochemically etched Ni wires

A. Nait Abdi and J. P. Bucher

Appl. Phys. Lett. 82, 430 (2003); http://dx.doi.org/10.1063/1.1539908 (3 pages) | Cited 8 times

Online Publication Date: 15 January 2003

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Nickel wires, a few 100 nm in diameter, with a resistance up to 20 Ω, have been prepared by controlled electrochemical etching of macroscopic wires. Although the wires are polycrystalline and the presence of domain walls can be inferred directly from the magnetoresistance curves, the switching field, HSW, for complete reversal is insensitive to details of the wire diameters provided their aspect ratio is larger than 100. Order of magnitude arguments show evidence for spin accumulation at domain walls, while the angular dependence HSW(ϑ) with respect to the wire axis is well described by the analytical form of the curling model, indicating a wider range of applicability of this model than previously thought. © 2003 American Institute of Physics.
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75.47.Np Metals and alloys
75.60.Ch Domain walls and domain structure
75.50.Cc Other ferromagnetic metals and alloys
75.60.Jk Magnetization reversal mechanisms
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