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16 Mar 2009

Volume 94, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 94, 111101 (2009); http://dx.doi.org/10.1063/1.3097278 (3 pages)

Ling Lu, Adam Mock, Tian Yang, Min Hsiung Shih, Eui Hyun Hwang, Mahmood Bagheri, Andrew Stapleton, Stephen Farrell, John O’Brien, and P. Daniel Dapkus
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Generation of spin-wave pulse trains by current-controlled magnetic mirrors

A. A. Serga, T. Neumann, A. V. Chumak, and B. Hillebrands

Appl. Phys. Lett. 94, 112501 (2009); http://dx.doi.org/10.1063/1.3098407 (3 pages) | Cited 7 times

Online Publication Date: 17 March 2009

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The evolution of a packet of long-wavelength, dipole-dominated spin waves trapped between two direct current-carrying wires placed on the surface of a ferrite film is observed by Brillouin light scattering. The wires act as semitransparent mirrors confining the packet. Because the spin-wave energy partially passes through these mirrors, trains of spin-wave packets are generated outside the trap. A numerical model is presented and applied to the case when the current in the wires is dynamically controlled. The dynamic control of the mirror reflectivity provides new functionalities interesting for the field of spin-wave logic like that of a spin-wave memory cell.
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75.50.Gg Ferrimagnetics
75.30.Ds Spin waves
75.70.Ak Magnetic properties of monolayers and thin films
78.35.+c Brillouin and Rayleigh scattering; other light scattering

Magnetic domain-wall motion by propagating spin waves

Dong-Soo Han, Sang-Koog Kim, Jun-Young Lee, Sebastian J. Hermsdoerfer, Helmut Schultheiss, Britta Leven, and Burkard Hillebrands

Appl. Phys. Lett. 94, 112502 (2009); http://dx.doi.org/10.1063/1.3098409 (3 pages) | Cited 22 times

Online Publication Date: 17 March 2009

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We found by micromagnetic simulations that the motion of a transverse wall (TW)–type domain wall in magnetic thin-film nanostripes can be manipulated via interaction with spin waves (SWs) propagating through the TW. The velocity of the TW motion can be controlled by changes of the frequency and amplitude of the propagating SWs. Moreover, the TW motion is efficiently driven by specific SW frequencies that coincide with the resonant frequencies of the local modes existing inside the TW structure. The use of propagating SWs, whose frequencies are tuned to those of the intrinsic TW modes, is an alternative approach for controlling TW motion in nanostripes.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.50.Tt Fine-particle systems; nanocrystalline materials
75.30.Ds Spin waves

Perpendicular spin torque promotes synchronization of magnetic tunnel junction based spin torque oscillators

Yan Zhou and Johan Åkerman

Appl. Phys. Lett. 94, 112503 (2009); http://dx.doi.org/10.1063/1.3100299 (3 pages) | Cited 13 times

Online Publication Date: 17 March 2009

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We study how the perpendicular spin transfer torque term (bj), present in magnetic tunneling junctions (MTJs), affects the synchronization of serially connected MTJ-based spin torque oscillators (MTJ-STOs). We find that bj modifies the intrinsic preferred I-V phase shift in single MTJ-STO in such a way that serially connected MTJ-STOs synchronize much more readily without the need for additional circuitry to change the I-V phase. This result strongly suggests that synchronization of serially connected MTJ-STOs should be significantly more straightforward than the previously attempted serial synchronization of giant magnetoresistance based STOs (GMR-STOs).
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.70.Ak Magnetic properties of monolayers and thin films
84.30.Ng Oscillators, pulse generators, and function generators
84.40.-x Radiowave and microwave (including millimeter wave) technology

High magnetoresistance tunnel junctions with Mg–B–O barriers and Ni–Fe–B free electrodes

J. C. Read, Judy J. Cha, William F. Egelhoff, Jr., H. W. Tseng, P. Y. Huang, Y. Li, David A. Muller, and R. A. Buhrman

Appl. Phys. Lett. 94, 112504 (2009); http://dx.doi.org/10.1063/1.3095595 (3 pages) | Cited 11 times

Online Publication Date: 18 March 2009

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The use of boron-alloyed electrodes with the radio frequency (rf) sputter deposition of MgO yields magnetic tunnel junctions (MTJs) with Mg–B–O tunnel barriers. After annealing, such MTJs can exhibit very high tunneling magnetoresistance (TMR) in the thin ( ∼ 1.0 nm) barrier regime. Scanning tunneling spectroscopy of Mg–B–O layers reveals a better defined, but smaller band gap in comparison to that of thin MgO. We produced Fe60Co20B20/Mg–B–O/Ni65Fe15B20 MTJs where after a 350 °C annealing the Ni–Fe–B free electrode crystallizes into a highly textured (001)-normal body centered cubic (bcc) crystal structure and the MTJs achieve 155% TMR.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.47.Np Metals and alloys
61.66.Dk Alloys

High-rate reactive ion etching of barium hexaferrite films using optimal CHF3/SF6 gas mixtures

Zhaohui Chen, Aria Yang, Changqing Xie, Qinghua Yang, C. Vittoria, and V. G. Harris

Appl. Phys. Lett. 94, 112505 (2009); http://dx.doi.org/10.1063/1.3099884 (3 pages) | Cited 5 times

Online Publication Date: 18 March 2009

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The high-rate reactive ion etching of c-axis oriented quasi-single-crystal barium hexaferrite (BaM) films, deposited on 6-H silicon carbide (0001) substrates, has been demonstrated. Arrays of BaM columns, having diameters of 1–4 μm and sharp vertical walls, were etched from BaM films at rates as high as 75 nm/min using an optimized sulfur hexafluoride and methyl trifluoride (SF6:CHF3, 3:1) gas mixture. Lateral features as small as 43 nm were fabricated and imaged.
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81.65.Cf Surface cleaning, etching, patterning
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Gg Ferrimagnetics
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Anisotropy of the superconducting transport properties of the LaAlO3/SrTiO3 interface

N. Reyren, S. Gariglio, A. D. Caviglia, D. Jaccard, T. Schneider, and J.-M. Triscone

Appl. Phys. Lett. 94, 112506 (2009); http://dx.doi.org/10.1063/1.3100777 (3 pages) | Cited 14 times

Online Publication Date: 18 March 2009

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The superconducting transport properties of the conducting LaAlO3/SrTiO3 interface have been investigated in perpendicular and parallel magnetic fields. A large anisotropy in the transport properties is measured and the two-dimensional nature of the superconducting gas is confirmed. Analyses of the resistance versus temperature and magnetic field, as well as of the correlation length as a function of the magnetic field close to the superconducting critical temperature (about 200 mK), yield an estimate of ∼ 10 nm for the superconducting layer thickness.
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74.25.F- Transport properties
74.10.+v Occurrence, potential candidates
74.78.-w Superconducting films and low-dimensional structures

Weak exchange effect and large refrigerant capacity in a bulk metallic glass Gd0.32Tb0.26Co0.20Al0.22

Yongsheng Liu, Jincang Zhang, Youquan Wang, Yanyan Zhu, Zhenglong Yang, Jing Chen, and Shixun Cao

Appl. Phys. Lett. 94, 112507 (2009); http://dx.doi.org/10.1063/1.3097237 (3 pages) | Cited 15 times

Online Publication Date: 19 March 2009

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The magnetic behavior and refrigeration capacity of Gd0.32Tb0.26Co0.20Al0.22, a bulk metallic glass (BMG) fabricated by a copper-mold suck-casting method, are investigated. The Curie temperature increases from 79 K at 200 Oe to 95 K at 50 000 Oe. A weak exchange field of 25 T in the BMG system, caused by the strong disorder, is derived by the mean-field approximation. The maximum magnetic entropy change (8.02 J kg−1 K−1) and the refrigerant capacity (642 J kg−1) for 5 T indicate the BMG has the better refrigerant efficiency compared to known magnetic refrigerants.
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75.30.Et Exchange and superexchange interactions
75.30.Sg Magnetocaloric effect, magnetic cooling
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Cc Other ferromagnetic metals and alloys

Electrostatically tunable magnetoelectric inductors with large inductance tunability

J. Lou, D. Reed, M. Liu, and N. X. Sun

Appl. Phys. Lett. 94, 112508 (2009); http://dx.doi.org/10.1063/1.3103273 (3 pages) | Cited 18 times

Online Publication Date: 19 March 2009

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A class of electrostatically tunable inductors with multiferroic composite cores consisting of Metglas/lead zirconate titanate/Metglas was demonstrated. These magnetoelectric inductors exhibit a large tunable inductance range ΔL/Lmin of up to 450%, together with improved quality factors. Such tunability of inductance and quality factor was due to a strong magnetoelectric coupling in the multiferroic composite core, which led to electric field induced permeability change. The concept of tuning inductance by electric field using multiferroic composite materials leads to a class of compact tunable inductors with minimum power consumption.
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85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
84.32.Hh Inductors and coils; wiring
75.80.+q Magnetomechanical effects, magnetostriction

Tunable ferromagnetic resonance in NiFe nanowires with strong magnetostatic interaction

Xiaoming Kou, Xin Fan, Hao Zhu, and John Q. Xiao

Appl. Phys. Lett. 94, 112509 (2009); http://dx.doi.org/10.1063/1.3103562 (3 pages) | Cited 15 times

Online Publication Date: 20 March 2009

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Magnetic materials with tunable ferromagnetic resonant (FMR) frequencies are highly desirable in microwave devices. In this manuscript, we demonstrate that the natural FMR of Ni90Fe10 nanowire array can be tuned continuously from 8.2 to 11.7 GHz by choosing different remanent states. Theoretical model based on magnetostatic interaction among nanowires has been developed to explain the observed phenomena.
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76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
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