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25 Jan 2010

Volume 96, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 96, 042501 (2010); http://dx.doi.org/10.1063/1.3291942 (3 pages)

Daniel Stickler, Robert Frömter, Holger Stillrich, Christian Menk, Carsten Tieg, Simone Streit-Nierobisch, Michael Sprung, Christian Gutt, Lorenz-M. Stadler, Olaf Leupold, Gerhard Grübel, and Hans Peter Oepen
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Soft x-ray holographic microscopy

Daniel Stickler, Robert Frömter, Holger Stillrich, Christian Menk, Carsten Tieg, Simone Streit-Nierobisch, Michael Sprung, Christian Gutt, Lorenz-M. Stadler, Olaf Leupold, Gerhard Grübel, and Hans Peter Oepen

Appl. Phys. Lett. 96, 042501 (2010); http://dx.doi.org/10.1063/1.3291942 (3 pages) | Cited 9 times

Online Publication Date: 25 January 2010

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We present a new x-ray microscopy technique based on Fourier transform holography (FTH), where the sample is separate from the optics part of the setup. The sample can be shifted with respect to the holography optics, thus large-scale or randomly distributed objects become accessible. As this extends FTH into a true microscopy technique, we call it x-ray holographic microscopy (XHM). FTH allows nanoscale imaging without the need for nanometer-size beams. Simple Fourier transform yields an unambiguous image reconstruction. We demonstrate XHM by studying the magnetic domain evolution of a Co/Pt multilayer film as function of locally varied iron overlayer thickness.
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07.85.Tt X-ray microscopes
42.40.My Applications
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ch Domain walls and domain structure
75.70.Kw Domain structure (including magnetic bubbles and vortices)
42.30.Wb Image reconstruction; tomography
42.30.Kq Fourier optics
07.60.Pb Conventional optical microscopes
07.85.-m X- and γ-ray instruments

Magnetic anisotropies in Ni–Mn–Ga films on MgO(001) substrates

V. A. Chernenko, V. Golub, J. M. Barandiarán, O. Y. Salyuk, F. Albertini, L. Righi, S. Fabbrici, and M. Ohtsuka

Appl. Phys. Lett. 96, 042502 (2010); http://dx.doi.org/10.1063/1.3293455 (3 pages) | Cited 5 times

Online Publication Date: 26 January 2010

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Ferromagnetic resonance was used to study the influence of temperature and film thickness on magnetic properties of Ni–Mn–Ga films deposited on single crystal MgO(001) substrates. It has been shown that depending on the film thickness and preparation condition, three configurations of magnetic anisotropy can be realized in these films. The temperature dependence of the anisotropy field is determined.
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75.30.Gw Magnetic anisotropy
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
68.55.-a Thin film structure and morphology

Strong perpendicular magnetic anisotropy in thick CoFeB films sandwiched by Pd and MgO layers

J. H. Jung, S. H. Lim, and S. R. Lee

Appl. Phys. Lett. 96, 042503 (2010); http://dx.doi.org/10.1063/1.3299009 (3 pages) | Cited 18 times

Online Publication Date: 27 January 2010

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A strong perpendicular magnetic anisotropy is formed in unit structures containing a thick CoFeB layer (2 nm) that are suitable for an MgO-based magnetic tunnel junction. The value of the coercivity, measured under perpendicular applied magnetic fields, is as high as 1050 Oe after annealing under optimum conditions. The intermixing between the Pd and the CoFeB and a low saturation magnetization of the Co-rich CoFeB layer are considered to be responsible for the strong perpendicular magnetic anisotropy.
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75.70.-i Magnetic properties of thin films, surfaces, and interfaces
75.30.Gw Magnetic anisotropy
75.47.Pq Other materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Tunable zero field ferromagnetic resonance in arrays of bistable magnetic nanowires

Joaquín De La Torre Medina, Luc Piraux, and Armando Encinas

Appl. Phys. Lett. 96, 042504 (2010); http://dx.doi.org/10.1063/1.3295706 (3 pages) | Cited 2 times

Online Publication Date: 28 January 2010

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The tunability of the zero field resonance frequency in arrays of bistable nanowires is demonstrated. Analysis of the resonance spectra for different remanent states show that the signal results from the superposition of the double absorption related to wires magnetized in both the positive and negative direction. An analytical model is proposed and validated which depends of the configuration dependent dipolar interaction and the peak amplitude of the superposing signals. The range over which the zero field resonance frequency can be tuned has a lower bound at remanence equal to one and a maxima when remanence vanishes.
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73.21.Hb Quantum wires
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Electrical transport properties of perpendicular magnetized Mn-Ga epitaxial films

Feng Wu, E. P. Sajitha, Shigemi Mizukami, Daisuke Watanabe, Terunobu Miyazaki, Hiroshi Naganuma, Mikihiko Oogane, and Yasuo Ando

Appl. Phys. Lett. 96, 042505 (2010); http://dx.doi.org/10.1063/1.3298363 (3 pages) | Cited 9 times

Online Publication Date: 28 January 2010

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We report electrical transport properties of perpendicular magnetized Mn-Ga epitaxial films with various thicknesses. The maximum extraordinary Hall resistivity and Hall angle is 11.5 μΩ cm and 5.7%, respectively, which is comparable to the highest value reported in amorphous Fe0.79Gd0.21 alloy. In the low temperature region, resistivity was proportional to T2.9 owing to the unconventional one-magnon scattering processes, indicating high spin polarization of this material.
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72.15.Gd Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
72.25.-b Spin polarized transport
75.30.Ds Spin waves
75.70.-i Magnetic properties of thin films, surfaces, and interfaces

High-Jc MgB2 Josephson junctions with operating temperature up to 40 K

Ke Chen, C. G. Zhuang, Qi Li, Y. Zhu, P. M. Voyles, X. Weng, J. M. Redwing, R. K. Singh, A. W. Kleinsasser, and X. X. Xi

Appl. Phys. Lett. 96, 042506 (2010); http://dx.doi.org/10.1063/1.3298366 (3 pages) | Cited 6 times

Online Publication Date: 28 January 2010

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Sandwich-type MgB2/MgO/MgB2 Josephson junctions with Au or MgB2 interconnection were fabricated using hybrid physical-chemical vapor deposited MgB2 thin films and RF-magnetron-sputtered MgO barrier. The junctions show properties similar to those in high-Jc Nb junctions with Jc up to 275 kA/cm2 at 4 K, which remains nonzero up to 40 K. Critical current modulations by applied magnetic field and constant voltage steps under microwave radiation were observed. Combined with the larger energy gaps in MgB2 than in Nb, the junctions presented here allow simple MgB2 digital circuits to work over 20 K or with a clock speed above 1 THz.
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74.50.+r Tunneling phenomena; Josephson effects
74.25.Sv Critical currents
68.55.-a Thin film structure and morphology
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)

Longitudinal and transverse magnetization components in thin films: A resonant magnetic reflectivity investigation using circularly polarized soft x-rays

J.-S. Lee, E. Vescovo, D. A. Arena, C.-C. Kao, J.-M. Beaujour, A. D. Kent, H. Jang, J.-H. Park, and J.-Y. Kim

Appl. Phys. Lett. 96, 042507 (2010); http://dx.doi.org/10.1063/1.3292207 (3 pages) | Cited 1 time

Online Publication Date: 29 January 2010

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An in-plane vectorial analysis of the magnetization of thin magnetic films is presented. Longitudinal soft x-ray resonant magnetic reflectivity curves display characteristic nodes where the longitudinal scattering component is suppressed by x-ray interference. The transverse magnetic component can be effectively retrieved at these nodal points, despite the use of circular polarization and longitudinal scattering geometry. Using a single geometric configuration, transverse and longitudinal magnetic hysteresis loops can be clearly separated. Calculations based on a Stoner–Wohlfarth model satisfactorily describe both loops. Therefore, this method presents a viable alternative to standard vectorial analysis techniques, with the additional benefit of element specificity.
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75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.78.-n Magnetization dynamics
68.55.-a Thin film structure and morphology

Spin-transfer switching in an epitaxial spin-valve nanopillar with a full-Heusler Co2FeAl0.5Si0.5 alloy

Hiroaki Sukegawa, Shinya Kasai, Takao Furubayashi, Seiji Mitani, and Koichiro Inomata

Appl. Phys. Lett. 96, 042508 (2010); http://dx.doi.org/10.1063/1.3297879 (3 pages) | Cited 14 times

Online Publication Date: 29 January 2010

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We report magnetization switching by spin-transfer torque in an epitaxial spin-valve nanopillar made with a half-metallic full-Heusler Co2FeAl0.5Si0.5 (CFAS) alloy. The CFAS/Ag/CFAS spin valves showed a magnetoresistance ratio of 7%–9%, and spin-transfer switching was clearly observed in the nanopillar by applying a relatively small dc current ( ∼ 106 A/cm2 in current density). Statistical analysis based on a thermal activation model revealed an averaged critical current density (Jc0) of 9.3×106 A/cm2 with a thermal stability factor (KV/kBT) of ∼ 40.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
72.15.Gd Galvanomagnetic and other magnetotransport effects
85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
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