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1 Dec 2008

Volume 93, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 93, 221101 (2008); http://dx.doi.org/10.1063/1.3036234 (3 pages)

Soon Moon Jeong, Na Young Ha, Mu Guen Chee, Fumito Araoka, Ken Ishikawa, Hideo Takezoe, Suzushi Nishimura, and Goro Suzaki
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Magnetism in Mn doped yttrium nitride: First-principles calculations

Xingtao Jia, Wei Yang, and Minghui Qin

Appl. Phys. Lett. 93, 222501 (2008); http://dx.doi.org/10.1063/1.3040684 (3 pages) | Cited 1 time

Online Publication Date: 3 December 2008

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The magnetism and aggregation trends in 25% and 12.5% Mn doped yttrium nitride (YN) have been investigated using the first-principles calculations. We demonstrate that the ferromagnetic delta doping is the ground state in higher concentration Mn doped YN, and the ferromagnetic homogeneous half-delta doping is the ground state in lower concentration Mn half-delta-doped YN. The latter shows ferromagnetic stabilization energy of 424.8 meV/Mn–Mn pair, which is substantially higher than many other compound semiconductor based magnetic semiconductors. Finally, we anticipate the potential spintronics application of Mn doped YN.
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75.30.Hx Magnetic impurity interactions
61.72.sd Impurity concentration
71.20.Nr Semiconductor compounds
71.15.-m Methods of electronic structure calculations
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Pp Magnetic semiconductors

Magnetic properties of Co-doped TiO2 anatase nanopowders

L. C. J. Pereira, M. R. Nunes, O. C. Monteiro, and A. J. Silvestre

Appl. Phys. Lett. 93, 222502 (2008); http://dx.doi.org/10.1063/1.3036534 (3 pages) | Cited 13 times

Online Publication Date: 4 December 2008

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This letter reports on the magnetic properties of Ti1−xCoxO2 anatase phase nanopowders with different Co contents. It is shown that oxygen vacancies play an important role in promoting long-range ferromagnetic order in the material studied in addition to the transition-metal doping. Furthermore, the results allow ruling out the premise of a strict connection between Co clustering and the ferromagnetism observed in the Co:TiO2 anatase system.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Pp Magnetic semiconductors
61.72.jd Vacancies

Influence of an interface domain wall on spin-valve giant magnetoresistance

T. Hauet, F. Montaigne, M. Hehn, Y. Henry, and S. Mangin

Appl. Phys. Lett. 93, 222503 (2008); http://dx.doi.org/10.1063/1.3041640 (3 pages) | Cited 3 times

Online Publication Date: 4 December 2008

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The magnetotransport properties of a Gd40Fe60/Gd10Fe90/Cu/Gd40Fe60 spin-valve based on amorphous ferrimagnetic GdFe layers are reported. The Gd40Fe60/Gd10Fe90 bilayer is an exchange spring structure that allows an interfacial domain wall to be controlled by an applied field. As this domain wall is nucleated, compressed, and annihilated, changes in the spin-valve current-in-plane magnetoresistance are observed. After separating the various magnetoresistance contributions we could deduce the effect of the interface domain wall on both the giant and anisotropic magnetoresistances.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ch Domain walls and domain structure
75.47.De Giant magnetoresistance
75.47.Np Metals and alloys
75.30.Et Exchange and superexchange interactions
75.50.Kj Amorphous and quasicrystalline magnetic materials

Anomalous training effect of perpendicular exchange bias in Pt/Co/Pt/IrMn multilayers

Z. Shi, X. P. Qiu, S. M. Zhou, X. J. Bai, and J. Du

Appl. Phys. Lett. 93, 222504 (2008); http://dx.doi.org/10.1063/1.3039059 (3 pages) | Cited 8 times

Online Publication Date: 5 December 2008

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For perpendicularly magnetized Pt/Co/Pt and Pt/Co/Pt/IrMn multilayers, the magnetization reversal process is accompanied by the pinned domain wall motion. For Pt/Co/Pt/IrMn multilayers, the asymmetry of hysteresis loops is always equal to zero and the exchange field HE decreases during consecutive hysteresis loops. It is interesting to find that the variation in HE with the cycle number n cannot be fitted by the empirical 1/math function. Meanwhile, the coercivity almost does not change. The unique feature of the training effect is caused by the magnetization reversal mechanism of the pinned domain wall motion in the Pt/Co/Pt multilayers.
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75.30.Et Exchange and superexchange interactions
75.30.Gw Magnetic anisotropy
75.60.Jk Magnetization reversal mechanisms

Exchange bias effect in a granular system of NiFe2O4 nanoparticles embedded in an antiferromagnetic NiO matrix

Z. M. Tian, S. L. Yuan, S. Y. Yin, L. Liu, J. H. He, H. N. Duan, P. Li, and C. H. Wang

Appl. Phys. Lett. 93, 222505 (2008); http://dx.doi.org/10.1063/1.3039071 (3 pages) | Cited 15 times

Online Publication Date: 5 December 2008

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A granular system composed of ferrimagnetic NiFe2O4 nanoparticles, about 8 nm in size, embedded in an antiferromagnetic NiO matrix has been synthesized by a high-temperature phase precipitation method from Fe-doped NiO matrix. Both the exchange bias field and vertical magnetization shift can be observed in this system below 250 K after field cooling, above which the exchange bias disappears. Furthermore, the exchange bias field shows a linear dependence on the magnetization shift. This observed exchange bias effect is explained in terms of the exchange interaction between the ferrimagnetic phase and the spin-glass-like phase at the interface.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.75.-c Magnetic properties of nanostructures
75.50.Gg Ferrimagnetics
75.50.Ee Antiferromagnetics
75.50.Tt Fine-particle systems; nanocrystalline materials
75.30.Et Exchange and superexchange interactions

Effect of oxygen vacancy on ferromagnetism and electric transport of bulk polycrystalline (In0.8Mo0.05Fe0.15)2O3

B. C. Zhao, H. W. Ho, B. Xia, L. H. Tan, A. C. Huan, and L. Wang

Appl. Phys. Lett. 93, 222506 (2008); http://dx.doi.org/10.1063/1.3039807 (3 pages) | Cited 5 times

Online Publication Date: 5 December 2008

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We report the effect of sintering pressure on ferromagnetism and electric transport properties of bulk polycrystalline (In0.8Mo0.05Fe0.15)2O3. Structural characterization by powder x-ray diffraction, magnetic and electronic characterization by magnetometry, and ac transport measurement indicate that (In0.8Mo0.05Fe0.15)2O3 shows intrinsic ferromagnetism under suitable fabrication condition. The ferromagnetism and electronic transport property of (In0.8Mo0.05Fe0.15)2O3 can be tuned by the oxygen vacancy in the sample.
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72.20.Fr Low-field transport and mobility; piezoresistance
75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
72.80.Jc Other crystalline inorganic semiconductors
61.72.jd Vacancies
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
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