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9 Apr 2007

Volume 90, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 90, 151106 (2007); http://dx.doi.org/10.1063/1.2722564 (3 pages)

P. Béjot, L. Bonacina, J. Extermann, M. Moret, J. P. Wolf, R. Ackermann, N. Lascoux, R. Salamé, E. Salmon, J. Kasparian, L. Bergé, S. Champeaux, C. Guet, N. Blanchot, O. Bonville, et al.
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Synthesis of ordered arrays of multiferroic NiFe2O4-Pb(Zr0.52Ti0.48)O3 core-shell nanowires

Ming Liu, Xin Li, Hassan Imrane, Yajie Chen, Trevor Goodrich, Zhuhua Cai, Katherine S. Ziemer, Jian Y. Huang, and Nian X. Sun

Appl. Phys. Lett. 90, 152501 (2007); http://dx.doi.org/10.1063/1.2722043 (3 pages) | Cited 45 times

Online Publication Date: 9 April 2007

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A synthesis method was developed for producing core-shell nanowire arrays, which involved a combination of a modified sol-gel process, electrochemical deposition, and subsequent oxidization in anodized nanoporous alumina membranes. This method was applied to generate ordered arrays of one dimensional multiferroic NiFe2O4 core and Pb(Zr0.52Ti0.48)O3 (PZT) shell nanostructures. Extensive microstructural, magnetic, and ferroelectric characterizations confirmed that the regular arrays of core-shell multiferroic nanostructures were composed of a spinel NiFe2O4 core and perovskite PZT shell. This synthesis method can be readily extended to prepare different core-shell nanowire arrays and is expected to pave the way for one dimensional core-shell nanowire arrays.
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81.16.Be Chemical synthesis methods
81.10.Dn Growth from solutions
81.10.Fq Growth from melts; zone melting and refining
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
82.45.Qr Electrodeposition and electrodissolution
77.80.-e Ferroelectricity and antiferroelectricity
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
61.46.-w Structure of nanoscale materials

Large magnetic moment observed in Co-doped ZnO nanocluster-assembled thin films at room temperature

Z. W. Zhao, B. K. Tay, J. S. Chen, J. F. Hu, B. C. Lim, and G. P. Li

Appl. Phys. Lett. 90, 152502 (2007); http://dx.doi.org/10.1063/1.2721140 (3 pages) | Cited 22 times

Online Publication Date: 11 April 2007

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Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn0.986Co0.014O nanoclusters remained wurtzite in structure with size of 5 nm. Compared with bulk ZnO, a blueshift of 0.28 eV was observed in the absorption edge of the film. Two photo-luminescence bands at 378 and 510 nm were detected. Room-temperature ferromagnetism was observed in doped ZnO nanocluster-assembled film. Moreover, it exhibited a large saturated magnetization of 1.4μB/Co and increased to 3.65μB/Co after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed.
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75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Dd Nonmetallic ferromagnetic materials
75.70.Ak Magnetic properties of monolayers and thin films
78.66.Hf II-VI semiconductors
78.55.Et II-VI semiconductors
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Microwave-assisted magnetization switching of Ni80Fe20 in magnetic tunnel junctions

T. Moriyama, R. Cao, John Q. Xiao, J. Lu, X. R. Wang, Q. Wen, and H. W. Zhang

Appl. Phys. Lett. 90, 152503 (2007); http://dx.doi.org/10.1063/1.2720746 (3 pages) | Cited 40 times

Online Publication Date: 12 April 2007

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Microwave-assisted magnetization switching was investigated using Fe30Co70/AlOx/Ni80Fe20 magnetic tunnel junctions incorporated with a coplanar waveguide. Coercivity field of Ni80Fe20 layer was dramatically reduced in a small amplitude microwave. The authors eliminated the thermal effect in coercivity reduction by comparing two types of measurements which are with and without spin precession in the presence of microwave. It was found that the coercivity reduction depends on both frequency and power of the microwave. The numerical simulation based on Landau-Lifshitz-Gilbert equation reproduced the trend of the experimental data. The results indicate that microwave can be an efficient means to switch the magnetization of a thin film.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Bb Fe and its alloys

Mn3Ga, a compensated ferrimagnet with high Curie temperature and low magnetic moment for spin torque transfer applications

Benjamin Balke, Gerhard H. Fecher, Jürgen Winterlik, and Claudia Felser

Appl. Phys. Lett. 90, 152504 (2007); http://dx.doi.org/10.1063/1.2722206 (3 pages) | Cited 43 times

Online Publication Date: 12 April 2007

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This work reports about the electronic, magnetic, and structural properties of the binary compound Mn3Ga. The tetragonal DO22 phase of Mn3Ga was successfully synthesized and investigated. It has been found that the material is hard magnetic with an energy product of Hc×Br = 52.5 kJ m−3 and an average saturation magnetization of about 0.25μB/at. at 5 K. The saturation magnetization indicates a ferrimagnetic order with partially compensating moments at the Mn atoms on crystallographically different sites. The Curie temperature is above 730 K where the onset of decomposition is observed. The electronic structure calculations indicate a nearly half-metallic ferrimagnetic order with 88% spin polarization at the Fermi energy.
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75.50.Gg Ferrimagnetics
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Ww Permanent magnets
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
71.20.Ps Other inorganic compounds
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