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20 Feb 2012

Volume 100, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 100, 082401 (2012); http://dx.doi.org/10.1063/1.3684972 (4 pages)

Elizabeth Rapoport and Geoffrey S. D. Beach
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Dynamics of superparamagnetic microbead transport along magnetic nanotracks by magnetic domain walls

Elizabeth Rapoport and Geoffrey S. D. Beach

Appl. Phys. Lett. 100, 082401 (2012); http://dx.doi.org/10.1063/1.3684972 (4 pages) | Cited 7 times

Online Publication Date: 21 February 2012

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The dynamics of fluid-borne superparamagnetic bead transport by field-driven domain walls in submicrometer ferromagnetic tracks is studied experimentally together with numerical and analytical modeling. Experiments show that nanotrack-guided domain walls can propel individual trapped beads through an aqueous medium at speeds approaching 1000 μm/s, 10 to 100 times faster than through any previously demonstrated mechanism.
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75.20.-g Diamagnetism, paramagnetism, and superparamagnetism
75.75.-c Magnetic properties of nanostructures
75.60.Ch Domain walls and domain structure
75.50.Tt Fine-particle systems; nanocrystalline materials

Sub-nanosecond switching of vortex cores using a resonant perpendicular magnetic field

Ruifang Wang and Xinwei Dong

Appl. Phys. Lett. 100, 082402 (2012); http://dx.doi.org/10.1063/1.3687909 (3 pages) | Cited 2 times

Online Publication Date: 21 February 2012

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We performed micromagnetic numerical studies on ultrafast switching of magnetic vortex cores (VCs) using a perpendicular magnetic field that oscillates at the eigenfrequency of a permalloy nanodisk. Our calculations show that a resonant magnetic field with amplitude of 30 mT stimulates strong axially symmetric magnetization oscillation and forces the vortex core to stay at the center of the nanodisk. The compression of the vortex core by spin wave leads to core reversal at 602 ps. This switching process is mediated by the propagation of a Neel wall across the sample thickness.
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75.75.-c Magnetic properties of nanostructures
75.30.Ds Spin waves

Structure and magnetotransport properties of epitaxial nanocomposite La0.67Ca0.33MnO3:SrTiO3 thin films grown by a chemical solution approach

Ling Fei, Leyi Zhu, Xuemei Cheng, Haiyan Wang, Stacy M. Baber, Joshua Hill, Qianglu Lin, Yun Xu, Shuguang Deng, and Hongmei Luo

Appl. Phys. Lett. 100, 082403 (2012); http://dx.doi.org/10.1063/1.3688048 (5 pages) | Cited 7 times

Online Publication Date: 21 February 2012

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Epitaxial La0.67Ca0.33MnO3:SrTiO3 (LCMO:STO) composite thin films have been grown on single crystal LaAlO3(001) substrates by a cost effective polymer-assisted deposition method. Both x-ray diffraction and high-resolution transmission electron microscopy confirm the growth of epitaxial films with an epitaxial relationship between the films and the substrates as (002)film||(002)sub and [202]film||[202]sub. The transport property measurement shows that the STO phase significantly increases the resistivity and enhances the magnetoresistance (MR) effect of LCMO and moves the metal-insulator transition to lower temperatures. For example, the MR values measured at magnetic fields of 0 and 3 T are −44.6% at 255 K for LCMO, −94.2% at 125 K for LCMO:3% STO, and −99.4% at 100 K for LCMO:5% STO, respectively.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Tt Fine-particle systems; nanocrystalline materials
75.75.-c Magnetic properties of nanostructures
72.20.My Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
71.30.+h Metal-insulator transitions and other electronic transitions

Ferromagnetism in thin-film Cr-doped topological insulator Bi2Se3

P. P. J. Haazen, J.-B. Laloë, T. J. Nummy, H. J. M. Swagten, P. Jarillo-Herrero, D. Heiman, and J. S. Moodera

Appl. Phys. Lett. 100, 082404 (2012); http://dx.doi.org/10.1063/1.3688043 (3 pages) | Cited 9 times

Online Publication Date: 23 February 2012

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We report on the observation of ferromagnetism in epitaxial thin films of the topological insulator compound Bi2Se3 with chromium doping. The structural, magnetic, and magnetoelectrical properties of Bi2Se3 were investigated for Cr concentrations up to 10%. For a Cr content up to ∼5% the films are of good crystalline quality, with the lattice parameter a decreasing and the lattice parameter c increasing with increasing Cr concentration. The Curie temperature reached a maximum TC = 20 K for 5.2% Cr. Well-defined ferromagnetic hysteresis in the magnetization and in the magnetoresistance was also observed in these films.
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75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
77.55.Nv Multiferroic/magnetoelectric films
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
72.20.My Galvanomagnetic and other magnetotransport effects
75.50.Dd Nonmetallic ferromagnetic materials

Direct detection of magnon spin transport by the inverse spin Hall effect

A. V. Chumak, A. A. Serga, M. B. Jungfleisch, R. Neb, D. A. Bozhko, V. S. Tiberkevich, and B. Hillebrands

Appl. Phys. Lett. 100, 082405 (2012); http://dx.doi.org/10.1063/1.3689787 (3 pages) | Cited 6 times

Online Publication Date: 24 February 2012

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Conversion of traveling magnons into an electron carried spin current is demonstrated in a time resolved experiment using a spatially separated inductive spin-wave source and an inverse spin Hall effect (ISHE) detector. A spin-wave packet is excited in a yttrium-iron garnet waveguide by a microwave signal and is detected 3 mm apart by an attached platinum layer as a delayed ISHE voltage pulse. The delay appears due to the finite spin-wave group velocity and proves the magnon spin transport. The experiment suggests the utilization of spin waves for the information transfer over macroscopic distances in spintronic devices and circuits.
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75.30.Ds Spin waves
75.50.Gg Ferrimagnetics
72.20.My Galvanomagnetic and other magnetotransport effects
72.25.-b Spin polarized transport
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