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19 Oct 2009

Volume 95, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 95, 162501 (2009); http://dx.doi.org/10.1063/1.3248257 (3 pages)

W. W. Lei, D. Liu, P. W. Zhu, X. H. Chen, Q. Zhao, G. H. Wen, Q. L. Cui, and G. T. Zou
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Ferromagnetic Sc-doped AlN sixfold-symmetrical hierarchical nanostructures

W. W. Lei, D. Liu, P. W. Zhu, X. H. Chen, Q. Zhao, G. H. Wen, Q. L. Cui, and G. T. Zou

Appl. Phys. Lett. 95, 162501 (2009); http://dx.doi.org/10.1063/1.3248257 (3 pages) | Cited 13 times

Online Publication Date: 19 October 2009

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Sc-doped AlN (AlN:Sc) sixfold-symmetrical hierarchical nanostructures were grown by direct current (dc) arc discharge plasma method using the direct reaction of Al and Sc metals with N2 gas. Energy-dispersive x-ray spectroscopy, x-ray diffractometry, and Raman spectra analysis clearly showed that Sc was doped in the AlN hierarchical nanostructures. The magnetization curves indicate the existence of room-temperature ferromagnetic behavior. The saturation magnetization and the coercive fields (Hc) of the AlN:Sc nanostructures are about 0.04 emu g−1 and 200 Oe, respectively. The results reveal that Sc is a potential nonmagnetic dopant for preparing diluted magnetic semiconductor nanomaterials.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Tt Fine-particle systems; nanocrystalline materials
78.30.Fs III-V and II-VI semiconductors
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
75.50.Pp Magnetic semiconductors

Saturation magnetization in supersaturated solid solution of Co–Cu alloy

Motohiro Yuasa, Kota Kajikawa, Masataka Hakamada, and Mamoru Mabuchi

Appl. Phys. Lett. 95, 162502 (2009); http://dx.doi.org/10.1063/1.3251795 (3 pages) | Cited 2 times

Online Publication Date: 20 October 2009

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The magnetovolume effect has been investigated using a supersaturated solid solution of a Co–19 at. %Cu alloy processed by electrodeposition. The enhanced saturation magnetization of the Co–Cu alloy was attributed to both metastable fcc Co and lattice expansion. The density functional theory using the CASTEP code revealed that an enhanced magnetic moment due to the magnetovolume effect is obtained in fcc Co, but not in hcp Co.
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75.30.Cr Saturation moments and magnetic susceptibilities
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.80.+q Magnetomechanical effects, magnetostriction
75.70.Ak Magnetic properties of monolayers and thin films
81.15.Pq Electrodeposition, electroplating

Magnetic force microscopy analysis of magnetization reversal in exchange-biased Co/CoO nanostructure arrays

S. Y. Suck, V. Neu, U. Wolff, S. Bahr, O. Bourgeois, and D. Givord

Appl. Phys. Lett. 95, 162503 (2009); http://dx.doi.org/10.1063/1.3248240 (3 pages) | Cited 3 times

Online Publication Date: 20 October 2009

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Asymmetry in the magnetization reversal processes of exchange bias Co/CoO rectangular nanodot arrays is revealed by magnetic force microscopy. One-step switching is found along the descending branch of the hysteresis cycle whereas rotational or multidomain processes are involved along the ascending branch. From a statistical analysis of the environment of each dot during reversal, it is concluded that dipolar interactions do not significantly influence the magnetization reversal processes.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Jk Magnetization reversal mechanisms
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Ch Domain walls and domain structure
75.30.Et Exchange and superexchange interactions
75.75.-c Magnetic properties of nanostructures

Tunable steady-state domain wall oscillator with perpendicular magnetic anisotropy

A. Bisig, L. Heyne, O. Boulle, and M. Kläui

Appl. Phys. Lett. 95, 162504 (2009); http://dx.doi.org/10.1063/1.3238314 (3 pages) | Cited 12 times

Online Publication Date: 22 October 2009

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We theoretically study domain wall oscillations upon the injection of a dc current through a geometrically constrained wire with perpendicular magnetic anisotropy. The frequency spectrum of the oscillation can be tuned by the injected current density and additionally by the application of an external magnetic field. Our analytical calculations are supported by micromagnetic simulations based on the Landau–Lifshitz–Gilbert equation. The simple concept of our localized steady-state oscillator might prove useful as a nanoscale microwave generator with possible applications in telecommunications or for rf-assisted writing in magnetic hard drives.
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75.30.Gw Magnetic anisotropy
75.60.Ch Domain walls and domain structure
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