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14 May 2007

Volume 90, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 90, 201101 (2007); http://dx.doi.org/10.1063/1.2739308 (3 pages)

Luca Sapienza, Angela Vasanelli, Cristiano Ciuti, Christophe Manquest, Carlo Sirtori, Raffaele Colombelli, and Ulf Gennser
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X-ray resonant magnetic scattering study of spontaneous ferrimagnetism

J. W. Kim, A. Kreyssig, P. Ryan, E. Mun, P. C. Canfield, and A. I. Goldman

Appl. Phys. Lett. 90, 202501 (2007); http://dx.doi.org/10.1063/1.2739403 (3 pages) | Cited 5 times

Online Publication Date: 14 May 2007

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The authors report on an x-ray resonant magnetic scattering measurement of ferromagnetic order, in the absence of an external magnetic field, using resonant dipole scattering at the Gd L2 edge of GdMn2Ge2. Measurements of the ferromagnetic order of the Gd sublattice were accomplished using undulator radiation at the Advanced Photon Source and polarization analysis of the diffracted beam to significantly reduce the charge scattering background. The magnetic origin of the resonant intensity was confirmed by its temperature dependence and the angular dependence of the scattering cross section.
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78.70.Ck X-ray scattering
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.50.Cc Other ferromagnetic metals and alloys
75.50.Gg Ferrimagnetics

Optimized thickness of superconducting aluminum electrodes for measurement of spin polarization with MgO tunnel barriers

Hyunsoo Yang, See-Hun Yang, Stuart S. P. Parkin, Titus Leo, and David J. Smith

Appl. Phys. Lett. 90, 202502 (2007); http://dx.doi.org/10.1063/1.2739333 (3 pages) | Cited 5 times

Online Publication Date: 15 May 2007

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Superconducting tunneling spectroscopy (STS) is one of the most useful techniques for measuring the tunneling spin polarization of magnetic materials, typically carried out using aluminum electrodes. Recent studies using MgO barriers have shown the extreme sensitivity of the spin polarization to annealing at temperatures up to ∼ 400 °C. Here the authors show that by optimizing the thickness of aluminum superconducting electrodes, STS measurements can be carried out even for such high annealing temperatures.
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74.50.+r Tunneling phenomena; Josephson effects
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Synthesis and magnetic properties of MnSb nanoparticles on Si-based substrates

H. Zhang, S. S. Kushvaha, S. Chen, X. Gao, D. Qi, A. T. S. Wee, and X.-S. Wang

Appl. Phys. Lett. 90, 202503 (2007); http://dx.doi.org/10.1063/1.2737908 (3 pages) | Cited 5 times

Online Publication Date: 16 May 2007

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MnSb nanoparticles with average lateral diameters 〈d〉 from 5 to 30 nm are synthesized on ultra thin silicon nitride covered Si(111) by codeposition of Mn and Sb. These MnSb particles possess sharp interfaces and a NiAs-type lattice. The Mn 2p x-ray absorption spectroscopy analysis shows broad line shapes due to the itinerant Mn 3d states. The particles with 〈d〉 = 5 and 8.5 nm are superparamagnetic at room temperature, while those of 〈d〉 = 15 and 30 nm exhibit ferromagnetic behavior.
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61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
75.50.Tt Fine-particle systems; nanocrystalline materials
81.07.Bc Nanocrystalline materials
75.50.Dd Nonmetallic ferromagnetic materials
78.70.Dm X-ray absorption spectra

Size dependent damping in picosecond dynamics of single nanomagnets

A. Barman, S. Wang, J. Maas, A. R. Hawkins, S. Kwon, J. Bokor, A. Liddle, and H. Schmidt

Appl. Phys. Lett. 90, 202504 (2007); http://dx.doi.org/10.1063/1.2740588 (3 pages) | Cited 17 times

Online Publication Date: 17 May 2007

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The authors use time-resolved cavity-enhanced magneto-optical Kerr spectroscopy to study the damping of magnetization precession in individual cylindrical nickel nanomagnets. A wide range of shapes (diameters of 5 μm–125 nm and aspect ratio: 0.03–1.2) is investigated. They observe a pronounced difference in damping between the micro- and nanomagnets. Microscale magnets show large damping at low bias fields, whereas nanomagnets exhibit bias field-independent damping. This behavior is explained by the interaction of in-plane and out-of-plane precession modes in microscale magnets that results in additional dissipative channels. The small and robust damping values on the nanoscale are promising for implementation of controlled precessional switching schemes in nanomagnetic devices.
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75.50.Ww Permanent magnets
78.20.Ls Magneto-optical effects
75.50.Tt Fine-particle systems; nanocrystalline materials
78.47.-p Spectroscopy of solid state dynamics
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Direct observation of the vortex core magnetization and its dynamics

K. W. Chou, A. Puzic, H. Stoll, D. Dolgos, G. Schütz, B. Van Waeyenberge, A. Vansteenkiste, T. Tyliszczak, G. Woltersdorf, and C. H. Back

Appl. Phys. Lett. 90, 202505 (2007); http://dx.doi.org/10.1063/1.2738186 (3 pages) | Cited 23 times

Online Publication Date: 18 May 2007

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Square-shaped thin film structures with a single magnetic vortex were investigated using a scanning transmission x-ray microscope. The authors report on the direct observation of the vortex core in 500×500 nm2, 40 nm thick soft magnetic Ni–Fe samples. The static configuration of the vortex core was imaged as well as the gyrotropic motion of the core under excitation with an in-plane alternating magnetic field. This enabled them to directly visualize the direction of the out-of-plane magnetization in the vortex core (up or down). The reversal of the core was effected by short bursts of an alternating magnetic field. An asymmetry appears in the core’s trajectory for its orientation pointing up and down, respectively.
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75.70.Ak Magnetic properties of monolayers and thin films
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Bb Fe and its alloys
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