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28 Dec 2009

Volume 95, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 95, 261901 (2009); http://dx.doi.org/10.1063/1.3268436 (3 pages)

Weiqiang Wang, Richard Clark, Aiichiro Nakano, Rajiv K. Kalia, and Priya Vashishta
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The role of Zr and B in room temperature magnetic entropy change of FeZrB amorphous alloys

Yanyan Wang and Xiaofang Bi

Appl. Phys. Lett. 95, 262501 (2009); http://dx.doi.org/10.1063/1.3276558 (3 pages) | Cited 11 times

Online Publication Date: 28 December 2009

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Effect of Zr and B on magnetocaloric effect for Fe90−xZr10Bx (x:3 ∼ 9) and Fe93−xZr7Bx (x:0 ∼ 13) amorphous alloys is presented. A clear dependence of peak magnetic entropy change (|ΔSmpk|) on (Zr+B) total contents rather than respective contents is observed and found to be correlated with average magnetic moment per Fe atom. Temperature of |ΔSmpk| corresponding to Curie temperature (Tc) is dependent on B contents, which is discussed in terms of exchange coupling. These findings exhibit in general the importance of Zr and B in seeking for an optimal |ΔSmpk| and meanwhile tunable Tc in Fe-based amorphous alloys.
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75.30.Sg Magnetocaloric effect, magnetic cooling
65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.30.Cr Saturation moments and magnetic susceptibilities

Direct measurements of the penetration depth in a superconducting film using magnetic force microscopy

E. Nazaretski, J. P. Thibodaux, I. Vekhter, L. Civale, J. D. Thompson, and R. Movshovich

Appl. Phys. Lett. 95, 262502 (2009); http://dx.doi.org/10.1063/1.3276563 (3 pages) | Cited 2 times

Online Publication Date: 28 December 2009

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We report the local measurements of the magnetic penetration depth λ in a superconducting Nb film using magnetic force microscopy (MFM). We developed a method for quantitative extraction of the penetration depth from single-parameter simultaneous fits to the lateral and height profiles of the MFM signal, and demonstrate that the obtained value is in excellent agreement with that obtained from the bulk magnetization measurements.
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74.78.-w Superconducting films and low-dimensional structures
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
74.25.Ha Magnetic properties including vortex structures and related phenomena
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Generation of local magnetic fields at megahertz rates for the study of domain wall propagation in magnetic nanowires

Bastiaan Bergman, Rai Moriya, Masamitsu Hayashi, Luc Thomas, Christy Tyberg, Yu Lu, Eric Joseph, Mary-Beth Rothwell, John Hummel, William J. Gallagher, Bert Koopmans, and Stuart S. P. Parkin

Appl. Phys. Lett. 95, 262503 (2009); http://dx.doi.org/10.1063/1.3265738 (3 pages) | Cited 1 time

Online Publication Date: 28 December 2009

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We describe a technique for generating local magnetic fields at megahertz rates along magnetic nanowires. Local and global magnetic fields are generated from buried copper fine-pitch wires fabricated on 200 mm silicon wafers using standard complementary metal-oxide-semiconductor back-end process technology. In combination with pump-probe scanning Kerr microscopy, we measure the static and dynamic propagation fields of domain walls in permalloy nanowires.
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75.60.Ch Domain walls and domain structure
75.50.Tt Fine-particle systems; nanocrystalline materials
81.16.-c Methods of micro- and nanofabrication and processing

Role of reversal incoherency in reducing switching field and switching field distribution of exchange coupled composite bit patterned media

T. Hauet, E. Dobisz, S. Florez, J. Park, B. Lengsfield, B. D. Terris, and O. Hellwig

Appl. Phys. Lett. 95, 262504 (2009); http://dx.doi.org/10.1063/1.3276911 (3 pages) | Cited 23 times

Online Publication Date: 29 December 2009

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Model exchange coupled composite media, namely [Co/Pd]5/Pd(t)/[Co/Ni]3/Co multilayers, deposited onto prepatterned substrates have been investigated for potential use in bit patterned recording. Optimizing the thickness of the Pd interlayer allows decreasing the switching field (HC) and switching field distribution (σSFD) while maintaining thermal stability. The dependence of the remanent coercivity on the external field angle indicates that the gain in HC and σSFD originates from the incoherent magnetization reversal introduced by slightly decoupling the hard and soft multilayer stacks. This tendency is confirmed by further reductions in HC and σSFD, when inserting another Pd interlayer within the hard [Co/Pd]5 stack.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Et Exchange and superexchange interactions
75.50.Ss Magnetic recording materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Jk Magnetization reversal mechanisms

Phase-locking and frustration in an array of nonlinear spin-torque nano-oscillators

Vasil Tiberkevich, Andrei Slavin, Elena Bankowski, and Grant Gerhart

Appl. Phys. Lett. 95, 262505 (2009); http://dx.doi.org/10.1063/1.3278602 (3 pages) | Cited 7 times

Online Publication Date: 29 December 2009

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We demonstrate that the cooperative dynamics of an array of coupled spin-torque nano-oscillators (STNO) can be controlled by introduction of an additional external phase shift βc between microwave current, which couples STNOs, and microwave voltage on the array. When this external phase shift βc compensates the intrinsic phase shift β0, caused by the STNO nonlinearity, a phase-locking regime with increased output power and vanishing inhomogeneous linewidth broadening is achieved. In the opposite case, when external and intrinsic phase shifts are added, the STNO array demonstrates a frustration regime with low output power and wide and noisy frequency spectrum.
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84.40.Dc Microwave circuits
84.30.Ng Oscillators, pulse generators, and function generators

Co doped ZnO(0001)-Zn by diffusion method and its magnetic properties

W. G. Xie, F. Y. Xie, X. L. Yu, K. Xue, J. B. Xu, J. Chen, and R. Zhang

Appl. Phys. Lett. 95, 262506 (2009); http://dx.doi.org/10.1063/1.3275713 (3 pages) | Cited 5 times

Online Publication Date: 30 December 2009

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The diffusion behaviors of Co clusters on clean ZnO(0001)-Zn single crystal surface and their magnetic properties are studied. Co clusters are deposited on the clean ZnO(0001)-Zn surface at room temperature and then undergone ultrahigh vacuum annealing until fully reconstructed. The replacement of Zn2+ by Co2+ is confirmed by scanning tunneling microscopy and x-ray photoelectron spectroscopy. The Co doped ZnO shows a weak ferromagnetism at room temperature with a saturation magnetic moment of 1.08 μB/Co. Our observations indicate that surface Zn vacancies facilitate Co diffusion, and the interplay of Co ion with internal O vacancies leads to the ferromagnetism.
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81.05.Dz II-VI semiconductors
75.50.Pp Magnetic semiconductors
61.72.Cc Kinetics of defect formation and annealing
81.40.Gh Other heat and thermomechanical treatments
79.60.Bm Clean metal, semiconductor, and insulator surfaces
68.35.Fx Diffusion; interface formation
75.50.Dd Nonmetallic ferromagnetic materials
75.30.Cr Saturation moments and magnetic susceptibilities
61.72.jd Vacancies

Enhancement in transition temperature and upper critical field of CeO0.8F0.2FeAs by yttrium doping

J. Prakash, S. J. Singh, A. Banerjee, S. Patnaik, and A. K. Ganguli

Appl. Phys. Lett. 95, 262507 (2009); http://dx.doi.org/10.1063/1.3280046 (3 pages) | Cited 8 times

Online Publication Date: 30 December 2009

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We report significant enhancement in superconducting properties of yttrium substituted Ce1−xYxOFFeAs superconductors. The polycrystalline samples were prepared by two step solid state reaction technique. X-ray diffraction confirmed tetragonal ZrCuSiAs structure with decrease in both a and c lattice parameters on increasing yttrium substitution (with fixed F content). With smaller ion Y in place of Ce, the transition temperature increased by 6 K. Yttrium doping also lead to higher critical fields as well as broader magnetization loops, particularly at elevated temperature.
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74.62.Dh Effects of crystal defects, doping and substitution
74.70.-b Superconducting materials other than cuprates
74.25.Ha Magnetic properties including vortex structures and related phenomena
61.66.Fn Inorganic compounds
81.20.-n Methods of materials synthesis and materials processing

Spin-wave propagation in a microstructured magnonic crystal

A. V. Chumak, P. Pirro, A. A. Serga, M. P. Kostylev, R. L. Stamps, H. Schultheiss, K. Vogt, S. J. Hermsdoerfer, B. Laegel, P. A. Beck, and B. Hillebrands

Appl. Phys. Lett. 95, 262508 (2009); http://dx.doi.org/10.1063/1.3279138 (3 pages) | Cited 19 times

Online Publication Date: 31 December 2009

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Transmission of microwave spin waves through a microstructured magnonic crystal in the form of a Permalloy waveguide of a periodically varying width was studied experimentally and theoretically. The spin wave characteristics were measured by spatially resolved Brillouin light scattering microscopy. A rejection frequency band was clearly observed. The band gap frequency was controlled by the applied magnetic field. The measured spin-wave intensity as a function of frequency and propagation distance is in good agreement with a model calculation.
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84.40.Az Waveguides, transmission lines, striplines
78.35.+c Brillouin and Rayleigh scattering; other light scattering
75.30.Ds Spin waves
42.70.Qs Photonic bandgap materials

Control of spin-wave phase and wavelength by electric current on the microscopic scale

Vladislav E. Demidov, Sergei Urazhdin, and Sergej O. Demokritov

Appl. Phys. Lett. 95, 262509 (2009); http://dx.doi.org/10.1063/1.3279152 (3 pages) | Cited 10 times

Online Publication Date: 31 December 2009

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We demonstrate experimentally the ability to control by electric current the phase and the wavelength of spin waves propagating in submicrometer magnetic waveguides. The dependence of the spin-wave characteristics on the current and on the excitation frequency was determined by phase-resolved microfocus Brillouin light scattering spectroscopy. We show that moderately small currents are sufficient to induce nearly twofold changes of the wavelength and spin-wave phase shift of more than ±π radians over a propagation distance of several micrometers.
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75.30.Ds Spin waves
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
78.35.+c Brillouin and Rayleigh scattering; other light scattering
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