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23 Jan 2012

Volume 100, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 100, 041101 (2012); http://dx.doi.org/10.1063/1.3675885 (4 pages)

Seung Ho Choi and Young L. Kim
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Complex evolution of the electronic structure of Cr with temperature

Ganesh Adhikary, R. Bindu, Swapnil Patil, and Kalobaran Maiti

Appl. Phys. Lett. 100, 042401 (2012); http://dx.doi.org/10.1063/1.3678183 (4 pages) | Cited 2 times

Online Publication Date: 23 January 2012

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Employing state-of-the-art high resolution photoemission spectroscopy, we studied the electronic structure evolution of Cr with temperature. Experimental results reveal signature of a pseudogap much below the spin density wave transition temperature. A sharp peak appears near the Fermi level at low temperatures presumably related to the orbital Kondo effect. These results provide possible origin of the complex electronic properties observed in this system.
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71.20.Be Transition metals and alloys
72.15.Qm Scattering mechanisms and Kondo effect
75.30.Ds Spin waves
75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena
79.60.Bm Clean metal, semiconductor, and insulator surfaces

Spectral line intensity irreversibility in circulatory plasma magnetization processes

Z. Q. Qu and G. T. Dun

Appl. Phys. Lett. 100, 042402 (2012); http://dx.doi.org/10.1063/1.3679179 (4 pages)

Online Publication Date: 23 January 2012

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Spectral line intensity variation is found to be irreversible in circulatory plasma magnetization process by experiments described in this paper, i.e., the curves illustrating spectral line photon fluxes irradiated from a light source immerged in a magnetic field by increasing the magnetic induction cannot be reproduced by decreasing the magnetic induction within the errors. There are two plasma magnetization patterns found. One shows that the intensities are greater at the same magnetic inductions during the magnetic induction decreasing process after the increasing, and the other gives the opposite effect. This reveals that the magneto-induced excitation and de-excitation process is irreversible like ferromagnetic magnetization. But the two irreversible processes are very different in many aspects stated in the text.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Xz Magnetized plasmas
52.50.Dg Plasma sources

Magnetic transition of plastic deformed Si-doped Ni3Mn alloy

K. Y. Ko, S. W. Ko, and J. G. Booth

Appl. Phys. Lett. 100, 042403 (2012); http://dx.doi.org/10.1063/1.3679618 (3 pages)

Online Publication Date: 24 January 2012

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Structural and magnetic properties of plastic deformed Si-doped Ni3Mn alloy were studied by high resolution x-ray diffraction, powder neutron diffraction, and diffuse magnetic scattering measurements. Both deformed and undeformed specimens showed disordered face-centered cubic structure with slightly different lattice parameters of 3.5961 Å and 3.5890 Å. Magnetic properties, however, showed significant differences; Néel temperatures of 87.5 K and 62.5 K, respectively, paramagnetic Curie temperatures of −325 K and 125 K, and effective magnetic moments per metal atom of 3.51 μB and 0.41 μB, respectively. It is considered that distortion of crystals and, hence, change of local environment of magnetic atoms due to the plastic deformation cause different magnetic behaviors.
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75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
81.40.Lm Deformation, plasticity, and creep
62.20.fq Plasticity and superplasticity
61.66.Fn Inorganic compounds
75.30.Cr Saturation moments and magnetic susceptibilities

Evidence of direct correlation between out-of-plane lattice parameter and metal-insulator transition temperature in oxygen-depleted manganite thin films

P. Orgiani, A. Yu. Petrov, R. Ciancio, A. Galdi, L. Maritato, and B. A. Davidson

Appl. Phys. Lett. 100, 042404 (2012); http://dx.doi.org/10.1063/1.3676268 (3 pages) | Cited 6 times

Online Publication Date: 24 January 2012

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We report on the role of oxygen content alone on structural and transport properties of La0.65Sr0.35MnO3−δ (LSMO) thin films. Identical films were deposited side-by-side during a single deposition run and subsequently post-annealed separately in vacuum to systematically vary the oxygen content. All films remained coherently strained to the SrTiO3 substrate, with no broadening of rocking curve widths after post-anneal. As oxygen content decreases, the LSMO unit cell expands while the metal-insulator transition temperature TMI decreases. A linear correlation between the out-of-plane lattice parameter and the metal-insulator transition temperature was observed.
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71.30.+h Metal-insulator transitions and other electronic transitions
81.40.Gh Other heat and thermomechanical treatments
61.66.-f Structure of specific crystalline solids
68.55.-a Thin film structure and morphology

Is N-doped SrO magnetic? A first-principles view

Hua Wu

Appl. Phys. Lett. 100, 042405 (2012); http://dx.doi.org/10.1063/1.3680087 (3 pages)

Online Publication Date: 24 January 2012

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N-doped SrO seems to be one of the model systems for d0 magnetism, in which magnetism (or ideally, ferromagnetism) was ascribed to the localized N 2p spins mediated by delocalized O 2p holes. Here, we offer a different view, using density functional calculations. We find that N-doped SrO with solely substitutional N impurities as widely assumed in the literature is unstable and instead that a pairing state of substitutional and interstitial N impurities is significantly more stable and has a much lower formation energy than the former by 6.7 eV. The stable (Nsub−Nint)2− dimers behave like a charged (N2)2− molecule and have each a molecular spin = 1. However, their spin-polarized molecular levels lie well inside the wide band gap of SrO, and thus, the exchange interaction is negligibly weak. As a consequence, N-doped SrO could not be ferromagnetic but paramagnetic.
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75.20.Ck Nonmetals
61.72.jj Interstitials
75.50.Dd Nonmetallic ferromagnetic materials

Direct imaging of both ferroelectric and antiferromagnetic domains in multiferroic BiFeO3 single crystal using x-ray photoemission electron microscopy

R. Moubah, M. Elzo, S. El Moussaoui, D. Colson, N. Jaouen, R. Belkhou, and M. Viret

Appl. Phys. Lett. 100, 042406 (2012); http://dx.doi.org/10.1063/1.3679101 (4 pages) | Cited 2 times

Online Publication Date: 24 January 2012

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In this work, we propose to study the magnetic and ferroelectric configurations in ferroelectric multidomain BiFeO3 single crystals. Using x-ray (magnetic) linear dichroism in a photoemission electron microscope (X-PEEM), we are able to directly image both the antiferromagnetic and ferroelectric domains. We find that inside one single ferroelectric domain several antiferromagnetic domains coexist. This is different from what was observed on epitaxial thin films, where the ferroelectric domains perfectly match the antiferromagnetic ones, but also from previous neutron measurements on ferroelectric monodomain single-crystals for which one single antiferromagnetic domain was identified. This underlines the fundamental differences between thin films, bulk samples, and single versus ferroelectric multidomain samples.
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77.80.Dj Domain structure; hysteresis
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
78.20.Fm Birefringence
79.60.Bm Clean metal, semiconductor, and insulator surfaces
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
75.50.Ee Antiferromagnetics
75.60.Ch Domain walls and domain structure

Enhanced magnetic properties of Dy3+ substituted Ni-Cu-Zn ferrite nanoparticles

Sagar E. Shirsath, R. H. Kadam, S. M. Patange, M. L. Mane, Ali Ghasemi, and Akimitsu Morisako

Appl. Phys. Lett. 100, 042407 (2012); http://dx.doi.org/10.1063/1.3679688 (4 pages) | Cited 7 times

Online Publication Date: 26 January 2012

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Dy3+ substituted Ni-Cu-Zn (Ni0.4Cu0.4Zn0.2DyxFe2−xO4) ferrite nanoparticles were obtained at 600 °C by synthesizing sol-gel auto-combustion method, and they exhibit a particle size of 12–21 nm. X‐ray diffraction patterns confirm the presence of secondary phase of DyFeO3 and Fe2O3 for the Dy3+ substituted samples. Ni‐Cu‐Zn ferries doped with Dy3+ possess better grain structure and growth than that of pure Ni‐Cu‐Zn ferrite. The saturation magnetization increases remarkably up to 81 emu/g with increasing the Dy3+ ions. The increased saturation magnetization related to increased exchange interactions between Fe‐Fe ions and also with increased particle size. Blocking temperature was found to decrease with increasing Dy3+ substitution. An enhancement in initial permeability and Curie temperature was observed with Dy3+ substitution.
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75.75.-c Magnetic properties of nanostructures
75.30.Et Exchange and superexchange interactions
75.50.Gg Ferrimagnetics
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.16.Rf Micro- and nanoscale pattern formation

Temperature dependence of microwave voltage emission associated to spin-transfer induced vortex oscillation in magnetic tunnel junction

P. Bortolotti, A. Dussaux, J. Grollier, V. Cros, A. Fukushima, H. Kubota, K. Yakushiji, S. Yuasa, K. Ando, and A. Fert

Appl. Phys. Lett. 100, 042408 (2012); http://dx.doi.org/10.1063/1.3680091 (3 pages) | Cited 3 times

Online Publication Date: 27 January 2012

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The temperature dependence of a vortex-based nano-oscillator induced by spin transfer torque (STVO) in magnetic tunnel junctions (MTJ) is considered. We obtain emitted signals with large output power and good signal coherence. Due to the reduced non-linearities compared to the uniform magnetization case, we first observe a linear decrease of linewidth with decreasing temperature. However, this expected behavior no longer applies at lower temperature and a bottom limit of the linewidth is measured.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.47.-m Magnetotransport phenomena; materials for magnetotransport
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
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