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26 Nov 2012

Volume 101, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 101, 221101 (2012); http://dx.doi.org/10.1063/1.4767646 (5 pages)

Mikhail A. Kats, Deepika Sharma, Jiao Lin, Patrice Genevet, Romain Blanchard, Zheng Yang, M. Mumtaz Qazilbash, D. N. Basov, Shriram Ramanathan, and Federico Capasso
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Room temperature magnetoresistance in a polyimide-Co granular film synthesized by vapor deposition polymerization

Kazuya Z. Suzuki, Hideto Yanagihara, Tomohiko Niizeki, Ken Kojio, and Eiji Kita

Appl. Phys. Lett. 101, 222401 (2012); http://dx.doi.org/10.1063/1.4768783 (4 pages)

Online Publication Date: 26 November 2012

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Magnetic and magnetotransport properties of pyromellitic dianhydride-4,4′-oxydianiline polyimide-Co granular thin films prepared by vapor deposition polymerization are investigated. The prepared sample is composed of Co particles with diameters of 2–3 nm homogeneously dispersed in a denatured polyimide matrix. The temperature dependence of the resistivity closely follows the T−1/2 law, suggesting that the dominant conduction mechanism is tunneling between metallic granules embedded in the insulating polyimide matrix. The magnetoresistances at 300 and 90 K are 2.6% and 3.0%, respectively. The results indicate that polyimide is a promising material for organic spintronics.
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75.47.Pq Other materials
72.20.My Galvanomagnetic and other magnetotransport effects
82.35.-x Polymers: properties; reactions; polymerization

Spin waves and small intrinsic damping in an in-plane magnetized FePt film

Zhifeng Chen, Ming Yi, Ming Chen, Shufa Li, Shiming Zhou, and Tianshu Lai

Appl. Phys. Lett. 101, 222402 (2012); http://dx.doi.org/10.1063/1.4768787 (4 pages)

Online Publication Date: 26 November 2012

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Laser-induced spin-wave dynamics in an in-plane magnetized FePt film is studied using all-optical pump-probe magneto-optical Kerr spectroscopy under different external fields and pump fluences. Uniform precession spin wave is observed. Nonlinear external field dependence of its frequency is found and well explained by the macrospin model of uniform precession. The effective damping shows a significant external-field dependence. Calculation taking account for magnetic inhomogeneity fits the external-field dependence well, revealing main magnetic inhomogeneity origin of the extrinsic damping. An intrinsic Gilbert damping parameter of <0.028 is inferred and shows potential applications of this film in magnonics.
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75.70.Ak Magnetic properties of monolayers and thin films
75.30.Ds Spin waves
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
78.20.Ls Magneto-optical effects

Design in Ni–Mn–In magnetic shape-memory alloy using compositional maps

Y. J. Huang, Q. D. Hu, and J. G. Li

Appl. Phys. Lett. 101, 222403 (2012); http://dx.doi.org/10.1063/1.4768235 (3 pages)

Online Publication Date: 26 November 2012

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Using empirical data, a map of composition versus magnetic properties was developed to design Ni-Mn-In magnetic shape-memory alloys. By the aid of this composition map, five alloys with desired properties were designed. A linear composition dependence of martensitic transformation temperature (Tm) and alloy was revealed. A transformation from austenite to martensite could be achieved at an electron concentration of ∼7.9. As such, a series of magnetic shape-memory alloys, which work at different conditions, can be designated under the guidance of a series of contour maps derived from Tm and thermal hysteresis.
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81.30.Kf Martensitic transformations
81.40.Lm Deformation, plasticity, and creep
81.40.Rs Electrical and magnetic properties related to treatment conditions
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
62.20.fg Shape-memory effect; yield stress; superelasticity
64.70.kd Metals and alloys

Temperature dependence of large exchange-bias in TbFe-Co/Pt

S. Romer, M. A. Marioni, K. Thorwarth, N. R. Joshi, C. E. Corticelli, H. J. Hug, S. Oezer, M. Parlinska-Wojtan, and H. Rohrmann

Appl. Phys. Lett. 101, 222404 (2012); http://dx.doi.org/10.1063/1.4767142 (3 pages) | Cited 1 time

Online Publication Date: 27 November 2012

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The exchange-bias effect provides unidirectional anisotropy to ferromagnetic thin-films in GMR and TMR sensors. It is weak because it relies on an inherently compensated coupling across a ferromagnet/antiferromagnet interface. We replace the antiferromagnet with a TbFe-based perpendicular-anisotropy amorphous ferrimagnet, coupling to an adjacent ferromagnet with 13-5 mJ/m2 for temperatures within 7.9–280 K. A large exchange-bias between 1.1 and 0.7 T in that temperature range ensues. The temperature dependence of the bias is step-like, and thus different from that of antiferromagnet-based exchange-bias systems. It suggests using this material in exchange-biased temperature assisted magnetic writing.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Et Exchange and superexchange interactions
75.30.Gw Magnetic anisotropy
75.50.Bb Fe and its alloys

Oscillating magnetocaloric effect on graphenes

M. S. Reis

Appl. Phys. Lett. 101, 222405 (2012); http://dx.doi.org/10.1063/1.4768789 (3 pages) | Cited 2 times

Online Publication Date: 28 November 2012

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The magnetocaloric effect of non-relativistic diamagnetic materials presents an oscillatory character due to the crossing of the Landau levels with the Fermi energy. This effect occurs at low temperature (ca 1 K) and high magnetic field (ca 10 T). Considering the relativistic properties of graphenes, a 2D massless diamagnetic material, these oscillations could be preserved and the effect occurs in a much higher temperature (ca 100 K), due to the huge Fermi velocity (106 m/s). In addition, the magnetocaloric effect can be tuned as either inverse or normal, by changing the magnetic field change in ca 3.4 T.
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75.30.Sg Magnetocaloric effect, magnetic cooling
73.22.Pr Electronic structure of graphene
71.70.Di Landau levels

Fabrication of single-dot planar nano-devices and the application to the exchange bias characterization in nano-pillar devices

Naganivetha Thiyagarajah, Lin Lin, and Seongtae Bae

Appl. Phys. Lett. 101, 222406 (2012); http://dx.doi.org/10.1063/1.4768944 (5 pages)

Online Publication Date: 30 November 2012

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Single dot [Co/Pd]5/FeMn nano-pillar devices with split nano-contacts are fabricated down to 150 × 150 nm2 dimensions, to understand the effects of nano-patterning on perpendicular exchange bias (PEB) characteristics. Using extraordinary Hall effect measurements, magnetic force microscopy, and numerical calculations, it is shown that the exchange bias field initially increases from the thin-film value, with decreasing dimensions down to a critical dimension below, which it again reduces. The PEB characteristics of the nano-pillar devices are found to be influenced by changes to the ferromagnetic (FM) layer anisotropy, exchange coupling between ferromagnetic and antiferromagnetic layers, in addition to edge effects caused by the fabrication process.
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
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