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29 Jun 2009

Volume 94, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 94, 263501 (2009); http://dx.doi.org/10.1063/1.3136905 (3 pages)

Changxin Chen, Wei Zhang, Eric Siu-Wai Kong, and Yafei Zhang
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Vortex matching effect in engineered thin films of NbN

Ajay D. Thakur, Shuuichi Ooi, Subbaiah P. Chockalingam, John Jesudasan, Pratap Raychaudhuri, and Kazuto Hirata

Appl. Phys. Lett. 94, 262501 (2009); http://dx.doi.org/10.1063/1.3167771 (3 pages) | Cited 7 times

Online Publication Date: 29 June 2009

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We report robust vortex matching effects in antidot arrays fabricated on thin films of NbN. The near absence of hysteresis between field sweep directions indicates a negligible residual pinning in the host thin films. Owing to the very small coherence length of NbN thin films (ξ<5 nm), the observations suggest the possibility of probing physics of vortices at true nanometer length scales in suitably fabricated structures.
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74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.78.-w Superconducting films and low-dimensional structures
74.10.+v Occurrence, potential candidates
74.25.Ha Magnetic properties including vortex structures and related phenomena
81.15.Cd Deposition by sputtering
68.65.Hb Quantum dots (patterned in quantum wells)
81.20.Wk Machining, milling
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Probing misalignment in exchange biased systems: A dynamic approach

C. Le Graët, D. Spenato, S. P. Pogossian, D. T. Dekadjevi, and J. Ben Youssef

Appl. Phys. Lett. 94, 262502 (2009); http://dx.doi.org/10.1063/1.3159822 (3 pages) | Cited 7 times

Online Publication Date: 29 June 2009

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An experimental method based on ferromagnetic resonance is proposed to quantify the misalignment between ferromagnetic and antiferromagnetic easy axis in exchange biased systems. Our experimental study deals with Ni81Fe19/Al2O3 and exchange biased Ni81Fe19/NiO bilayers. Performing ferromagnetic resonance studies, we demonstrate that the misalignment is present in the exchange biased system. It is revealed by an asymmetry of the resonance field angular dependence. Using a simple model, the angle of misalignment is determined.
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75.30.Et Exchange and superexchange interactions
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Electronic structure characterization of La2NiMnO6 epitaxial thin films using synchrotron-radiation photoelectron spectroscopy and optical spectroscopy

M. Kitamura, I. Ohkubo, M. Matsunami, K. Horiba, H. Kumigashira, Y. Matsumoto, H. Koinuma, and M. Oshima

Appl. Phys. Lett. 94, 262503 (2009); http://dx.doi.org/10.1063/1.3159826 (3 pages) | Cited 6 times

Online Publication Date: 30 June 2009

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Electronic structures of La2NiMnO6 epitaxial films are characterized using synchrotron-radiation photoelectron spectroscopy and optical spectroscopy. X-ray absorption spectra reveal that the valence states of Ni2+ and Mn4+ are dominant. The electronic structure at the valence band maximum is mainly derived from the Mn 3d state. The conduction band minimum is composed mostly of the Mn 3d-O 2p hybridized state. The optical gap is estimated to be about 1.5 eV based on the optical conductivity derived from optical spectra.
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71.20.Nr Semiconductor compounds
79.60.Bm Clean metal, semiconductor, and insulator surfaces
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
78.70.Dm X-ray absorption spectra
78.66.Li Other semiconductors
75.50.Pp Magnetic semiconductors
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials

Strong perpendicular magnetic anisotropy in Ni/Co(111) single crystal superlattices

S. Girod, M. Gottwald, S. Andrieu, S. Mangin, J. McCord, Eric E. Fullerton, J.-M. L. Beaujour, B. J. Krishnatreya, and A. D. Kent

Appl. Phys. Lett. 94, 262504 (2009); http://dx.doi.org/10.1063/1.3160541 (3 pages) | Cited 5 times

Online Publication Date: 30 June 2009

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Single crystal Ni/Co(111) superlattices have been grown by molecular beam epitaxy. The Ni thickness is 3 ML whereas the Co thickness varies from 0.2 to 4 ML. The superlattices were studied using magnetometry and ferromagnetic resonance spectroscopy and they all exhibit strong perpendicular to the plane magnetic anisotropy. The maximum magnetocrystalline anisotropy is obtained for one cobalt monolayer. Kerr microscopy measurements show the variation of domain pattern as the Co layer thickness changes.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Gw Magnetic anisotropy
75.70.Kw Domain structure (including magnetic bubbles and vortices)
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.70.Ak Magnetic properties of monolayers and thin films

Electric detection of spin wave resonance using inverse spin-Hall effect

K. Ando, J. Ieda, K. Sasage, S. Takahashi, S. Maekawa, and E. Saitoh

Appl. Phys. Lett. 94, 262505 (2009); http://dx.doi.org/10.1063/1.3167826 (3 pages) | Cited 28 times

Online Publication Date: 1 July 2009

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Spin wave resonance in Ni81Fe19/Pt thin wire arrays has been investigated using the inverse spin-Hall effect (ISHE). The spin wave in the Ni81Fe19 layer drives spin pumping, generation of spin currents from magnetization precession, and the pumped spin current is converted into a charge current by ISHE in the Pt layer. We found an electromotive force transverse to the spatial and the spin-polarization directions of the spin current. The experimental results indicate that the amplitude of the electromotive force is proportional to the spin wave resonance absorption intensity, enabling the electric measurement of spin wave resonance in nanostructured magnetic systems.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Ak Magnetic properties of monolayers and thin films
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.50.Tt Fine-particle systems; nanocrystalline materials
61.46.-w Structure of nanoscale materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)

Tunneling interlayer exchange coupling between oxide ferrimagnets: Analysis for Fe3O4/vac/Fe3O4 case

Han-Chun Wu, O. N. Mryasov, K. Radican, and I. V. Shvets

Appl. Phys. Lett. 94, 262506 (2009); http://dx.doi.org/10.1063/1.3167360 (3 pages)

Online Publication Date: 2 July 2009

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We have investigated tunneling interlayer exchange coupling (TIEC) between ferrimagnetic Fe3O4 films via a tunneling barrier. In this investigation we employ ab initio density functional theory to study a generic tunneling junction incorporating ferrimagnets Fe3O4/vac/Fe3O4. In contrast with previously established TIEC theory, calculated thickness dependence is nonmonotonic and accompanied by TIEC sign change. Our calculations clearly demonstrate that TIEC is controlled mainly by an interfacial oxygen induced spin polarization. These results emphasize the importance of localized and strongly directional electronic interactions at the interface, thus showing limitations of free electron model treatment of the problem.
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75.30.Et Exchange and superexchange interactions
72.25.Mk Spin transport through interfaces
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Gg Ferrimagnetics

Temperature dependence of the magnetoresistance in Fe/MgO core/shell nanoparticles

C. Martinez-Boubeta, Ll. Balcells, S. Valencia, D. Schmitz, C. Monty, and B. Martínez

Appl. Phys. Lett. 94, 262507 (2009); http://dx.doi.org/10.1063/1.3168647 (3 pages) | Cited 6 times

Online Publication Date: 2 July 2009

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The temperature dependence of magnetoresistance (MR) of powdered samples consisting of spherical Fe/MgO core/shell nanoparticles was analyzed. A change of the MR from normal at room temperature to inverse at low temperatures was observed. Concomitant with this, samples showed a sudden increase in the electrical resistance when approaching TV ≈ 120 K, i.e., indicative of the Verwey transition temperature of Fe3O4. Thus, signaling the existence of magnetite at the Fe/MgO interface, further confirmed by means of x-ray magnetic circular dichroism. The change from normal to inverse MR is related to the increase in resistance of Fe3O4 on crossing the Verwey transition and reflects the negative spin polarization of Fe3O4.
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73.40.Ns Metal-nonmetal contacts
78.20.Ls Magneto-optical effects
73.63.-b Electronic transport in nanoscale materials and structures
75.47.-m Magnetotransport phenomena; materials for magnetotransport
75.47.Pq Other materials
72.25.Mk Spin transport through interfaces
78.70.Dm X-ray absorption spectra

Size effects in submicron exchange bias square elements

G. Vallejo-Fernandez and J. N. Chapmam

Appl. Phys. Lett. 94, 262508 (2009); http://dx.doi.org/10.1063/1.3170233 (3 pages) | Cited 4 times

Online Publication Date: 2 July 2009

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The behavior of submicron exchange bias square elements has been investigated for systems containing metallic polycrystalline layers. Numerical simulations using a simple theoretical model show that the exchange bias for such elements can increase and/or decrease depending on the microstructure of the antiferromagnetic layer and, in particular, its grain size distribution. The predictions are based on a granular model of exchange bias that accounts for grain cutting at the edges of the nanoelements that takes place during ion milling/etching. This leads to distributions of exchange bias fields that can be quite broad, especially in sub-250 nm elements.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Ee Antiferromagnetics
75.50.Tt Fine-particle systems; nanocrystalline materials
75.30.Et Exchange and superexchange interactions
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