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5 Nov 2012

Volume 101, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 101, 193101 (2012); http://dx.doi.org/10.1063/1.4764508 (4 pages)

Ryan T. Tucker, Allan L. Beaudry, Joshua M. LaForge, Michael T. Taschuk, and Michael J. Brett
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Magnetic field sensor with voltage-tunable sensing properties

Witold Skowroński, Piotr Wiśniowski, Tomasz Stobiecki, Susana Cardoso, Paulo P. Freitas, and Sebastiaan van Dijken

Appl. Phys. Lett. 101, 192401 (2012); http://dx.doi.org/10.1063/1.4765350 (3 pages)

Online Publication Date: 5 November 2012

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We report on a magnetic field sensor based on CoFeB/MgO/CoFeB magnetic tunnel junctions. By taking advantage of the perpendicular magnetic anisotropy of the MgO/CoFeB interface, the magnetization of the sensing layer is tilted out-of-plane which results in a linear magnetoresistance response to in-plane magnetic fields. The application of a bias voltage across the MgO tunnel barrier of the sensor affects the magnetic anisotropy and thereby its sensing properties. We propose a voltage-tunable magnetic field sensor design that allows for active control of the sensitivity and the operating field range by the strength and polarity of the applied bias voltage.
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07.55.-w Magnetic instruments and components

Application of local transverse fields for domain wall control in ferromagnetic nanowire arrays

Andrew Kunz and Jesse Vogeler-Wunsch

Appl. Phys. Lett. 101, 192402 (2012); http://dx.doi.org/10.1063/1.4766173 (4 pages)

Online Publication Date: 6 November 2012

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In ferromagnetic nanowire arrays, where each wire contains multiple domain walls, it will be necessary to select an individual domain wall (DW) to move. In the field driven DW case, the field is typically applied globally affecting all of the domain walls in the system. We present micromagnetic simulation results demonstrating selectivity and control of an individual DW in such an array of nanowires using a combination of global and locally generated magnetic fields. Arranging the orientation of the local field allows for selectivity of a specific DW and its controllable movement to a new location.
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75.60.Ch Domain walls and domain structure
75.75.-c Magnetic properties of nanostructures
75.78.Cd Micromagnetic simulations
75.50.-y Studies of specific magnetic materials

Suppression of spin relaxation in rubrene nanowire spin valves

Kazi M. Alam, Srikrishna C. Bodepudi, Ryan Starko-Bowes, and Sandipan Pramanik

Appl. Phys. Lett. 101, 192403 (2012); http://dx.doi.org/10.1063/1.4765655 (5 pages)

Online Publication Date: 7 November 2012

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We report spin valve measurements performed on vertically oriented array of amorphous rubrene (5,6,11,12-tetraphenylnaphthacene) nanowires. Compared to previously reported rubrene thin-film spin valves, rubrene nanowires exhibit significant suppression of spin relaxation. Our results indicate spin-orbit interaction to be the dominant mechanism and are consistent with recent theoretical works, which suggest spin admixture parameter as a crucial ingredient in determining spin relaxation length.
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.

Inducing vortex formation in multilayered circular dots using remanent curves

Dong-Ok Kim, Dong Ryeol Lee, Yongseong Choi, Vitali Metlushko, Jihwey Park, Jae-Young Kim, and Ki Bong Lee

Appl. Phys. Lett. 101, 192404 (2012); http://dx.doi.org/10.1063/1.4766347 (4 pages)

Online Publication Date: 8 November 2012

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We report field manipulation of magnetic vortex states in Co(30 nm)/Cu(3 nm)/Ni80Fe20 (20 nm)-multilayer dot arrays via remanent curve. The element-resolved resonant x-ray magnetic measurements, combined with micromagnetic simulations, show vortex formation in the Co layer but not in the NiFe layer along the major hysteresis loop. Although the two magnetic layers are not directly coupled due to the presence of the Cu interlayer, the NiFe layer is strongly influenced by the dipolar field from uncompensated magnetic poles in the Co layer. Using remanent curves, we demonstrate that the single vortex state can be induced simultaneously in both layers.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Synthesis and magnetostrictive properties of Pr(Fe1.95B0.05)1.93 bulk nanocrystalline alloy

Y. G. Shi, C. C. Hu, J. Y. Fan, D. N. Shi, L. Y. Lv, and S. L. Tang

Appl. Phys. Lett. 101, 192405 (2012); http://dx.doi.org/10.1063/1.4767127 (4 pages) | Cited 1 time

Online Publication Date: 9 November 2012

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The structure, magnetic properties, and magnetostriction of Pr(Fe1.95B0.05)1.93 alloys prepared by annealing its precursor amorphous ribbons under high pressure were investigated. It was found that Pr(Fe1.95B0.05)1.93 single cubic Laves phase could be obtained only when the pressure is up to 3 GPa. The average grain size about 20 nm is found in the sample synthesized under 6 GPa. A large linear magnetostriction of 541 ppm at 3 kOe is observed in the Pr(Fe1.95B0.05)1.93 compound synthesized under 6 GPa, which is 25% larger than that under 3 GPa. The present work offers an effective method to obtain bulk nanocrystalline magnetostrictive compounds.
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75.75.Cd Fabrication of magnetic nanostructures
61.46.Hk Nanocrystals
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.80.+q Magnetomechanical effects, magnetostriction
81.40.Gh Other heat and thermomechanical treatments
62.50.-p High-pressure effects in solids and liquids

Spin-wave propagation and transformation in a thermal gradient

Björn Obry, Vitaliy I. Vasyuchka, Andrii V. Chumak, Alexander A. Serga, and Burkard Hillebrands

Appl. Phys. Lett. 101, 192406 (2012); http://dx.doi.org/10.1063/1.4767137 (4 pages)

Online Publication Date: 9 November 2012

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The influence of a thermal gradient on the propagation properties of externally excited dipolar spin waves in a magnetic insulator waveguide is investigated. It is shown that spin waves propagating towards a colder region along the magnetization direction continuously reduce their wavelength. The wavelength increase of a wave propagating into a hotter region was utilized to realize its decomposition in the partial waveguide modes which are reflected at different locations. This influence of temperature on spin-wave properties is mainly caused by a change in the saturation magnetization and yields promising opportunities for the manipulation of spin waves in spin-caloritronic applications.
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84.40.Az Waveguides, transmission lines, striplines
84.40.-x Radiowave and microwave (including millimeter wave) technology

Electrically induced decrease of magnetization in Ca3Mn2O7

Wenka Zhu, Li Pi, Yuanjie Huang, Shun Tan, and Yuheng Zhang

Appl. Phys. Lett. 101, 192407 (2012); http://dx.doi.org/10.1063/1.4767139 (4 pages)

Online Publication Date: 9 November 2012

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The magnetoelectric effect of Ca3Mn2O7 is verified by measuring the electric field dependence of magnetization. The magnetization is reduced by the electric field, as much as nearly 6% at 4 K under 100 Oe magnetic field and 40 kV/m electric field. There are two theoretical models in previous researches. Harris's model [A. B. Harris, Phys. Rev. B 84, 064116 (2011)], based on the rotating effect of electric field predicts electric-field-direction dependence of the magnetization decrease. Benedek and Fennie's model [N. A. Benedek and C. J. Fennie, Phys. Rev. Lett. 106, 107204 (2011)] emphasizes the stretching effect of electric field and predicts direction independence. The experimental results support Benedek and Fennie's framework and conflict with Harris's prediction. We argue that the large anisotropy and the antiferromagnetic nature impede the rotation of domains and suppress the rotating effect. In the coupling of magnetic ordering and ferroelectric ordering, the oxygen octahedron tilt distortion (X3−) plays an essential role.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
77.80.Fm Switching phenomena
75.85.+t Magnetoelectric effects, multiferroics
75.30.Gw Magnetic anisotropy
75.50.Ee Antiferromagnetics
75.60.Ch Domain walls and domain structure

Conductance of single-atom magnetic junctions: A first-principles study

Yi-qun Xie, Qiang Li, Lei Huang, Xiang Ye, and San-Huang Ke

Appl. Phys. Lett. 101, 192408 (2012); http://dx.doi.org/10.1063/1.4766733 (4 pages)

Online Publication Date: 9 November 2012

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We present a first-principles investigation to show that the contact conductance of a half conductance quantum (G0/2) found previously does not generally hold for single-atom magnetic junctions composed of a tip and an adatom adsorbed on a surface. The contact conductance of the Ni-Co/Co(111) junction is approximately G0/2, while for the Co-Co/Co(111), Ni-Ni/Ni(111), and Ni-Ni/Ni(001) junctions the contact conductances are 0.80G0, 1.55G0, and 1.77G0, respectively. The deviation from G0/2 is mainly caused by the variation of the spin-down conductance largely determined by the minority d orbitals, as the spin-up one changes little for different junctions.
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73.40.Jn Metal-to-metal contacts
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
71.15.-m Methods of electronic structure calculations
71.20.Gj Other metals and alloys
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