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21 Feb 2011

Volume 98, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 98, 081101 (2011); http://dx.doi.org/10.1063/1.3555489 (3 pages)

B. Cluzel, K. Foubert, L. Lalouat, J. Dellinger, D. Peyrade, E. Picard, E. Hadji, and F. de Fornel
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Tunable magnonic frequency and damping in [Co/Pd]8 multilayers with variable Co layer thickness

S. Pal, B. Rana, O. Hellwig, T. Thomson, and A. Barman

Appl. Phys. Lett. 98, 082501 (2011); http://dx.doi.org/10.1063/1.3559222 (3 pages) | Cited 12 times

Online Publication Date: 23 February 2011

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We report the experimental observation of collective picosecond magnetization dynamics in [Co/Pd]8 multilayers with perpendicular magnetic anisotropy. The precession frequency shows large and systematic variation from about 5 GHz to about 90 GHz with the decrease in the Co layer thickness from 1.0 to 0.22 nm due to the linear increase in the perpendicular magnetic anisotropy. The damping coefficient α is found to be inversely proportional to the Co layer thickness and a linear relation between the perpendicular magnetic anisotropy and α is established. We discuss the possible reasons behind the enhanced damping as the d-d hybridization at the interface and spin pumping. These observations are significant for the applications of these materials in spintronics and magnonic crystals.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Gw Magnetic anisotropy
75.78.Jp Ultrafast magnetization dynamics and switching
75.30.Ds Spin waves
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

Engineering the ferromagnetic domain size for optimized imaging of the pinned uncompensated spins in exchange-biased samples by magnetic force microscopy

N. R. Joshi, S. Özer, T. V. Ashworth, P. G. Stickar, S. Romer, M. A. Marioni, and H. J. Hug

Appl. Phys. Lett. 98, 082502 (2011); http://dx.doi.org/10.1063/1.3559228 (3 pages) | Cited 1 time

Online Publication Date: 24 February 2011

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Magnetic force microscopy (MFM) is able to image and quantify patterns of pinned uncompensated spins (UCS) in exchange-biased samples with high spatial resolution and submonolayer spin sensitivity. However, MFM can only detect magnetic moment distributions with spatial wavelengths within a certain range. Samples with large domains, homogeneous, or divergence-free magnetization fields are not accessible to MFM analysis. In this work we discuss the sample structure constraints placed by the requirement to measure UCS at high spatial resolution, and point out a method to engineer the size of the ferromagnetic domains accordingly.
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75.60.Ch Domain walls and domain structure
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities

Tuning anomalous Hall conductivity in L10 FePt films by long range chemical ordering

M. Chen, Z. Shi, W. J. Xu, X. X. Zhang, J. Du, and S. M. Zhou

Appl. Phys. Lett. 98, 082503 (2011); http://dx.doi.org/10.1063/1.3556616 (3 pages) | Cited 3 times

Online Publication Date: 24 February 2011

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For L10 FePt films, the anomalous Hall conductivity σxy = −aσxx−b, where a = a0f(T), b = b0f(T), and f(T) is the temperature dependence factor of the spontaneous magnetization. With increasing chemical long range ordering S, a0 changes its sign accompanied by a reduction of its magnitude and b0 increases monotonically. The spin-orbit coupling strength is suggested to increase with increasing S. As an approach, the long range chemical ordering can be used to control the anomalous Hall effect in ferromagnetic alloy films.
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73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
72.15.Gd Galvanomagnetic and other magnetotransport effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Current-induced domain wall motion in perpendicularly magnetized CoFeB nanowire

S. Fukami, T. Suzuki, Y. Nakatani, N. Ishiwata, M. Yamanouchi, S. Ikeda, N. Kasai, and H. Ohno

Appl. Phys. Lett. 98, 082504 (2011); http://dx.doi.org/10.1063/1.3558917 (3 pages) | Cited 11 times

Online Publication Date: 24 February 2011

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Current-induced domain wall motion in perpendicularly magnetized CoFeB nanowires with a stack structure of Ta(1.0 nm)/CoFeB(1.2 nm)/MgO(2.0 nm)/Ta(1.0 nm) was investigated. Domain wall motion driven by adiabatic spin-transfer torque was observed at a current of about 74 μA, corresponding to a current density of 6.2×107 A/cm2. The obtained results were compared with those of a micromagnetic simulation and the spin polarization of the CoFeB was estimated to be 0.72.
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75.75.Fk Domain structures in nanoparticles
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Ch Domain walls and domain structure

Atomic structure of tip apex for spin-polarized scanning tunneling microscopy

G. Rodary, J.-C. Girard, L. Largeau, C. David, O. Mauguin, and Z.-Z. Wang

Appl. Phys. Lett. 98, 082505 (2011); http://dx.doi.org/10.1063/1.3558920 (3 pages) | Cited 2 times

Online Publication Date: 24 February 2011

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We present a high resolution transmission electron microscopy study of a Cr-coated W tip apex prepared for spin-polarized scanning tunneling microscopy (SP-STM). The characterization of the tip apex structure has been done with atomic resolution. We show that the Cr film is epitaxially grown on W and presents a monocrystalline phase. The surface analysis of the apex reveals roughness which gives rise to structures that can be considered as nanotips. In spite of the monocrystalline structure of these nanotips, we show that their spin arrangement and resulting magnetization direction cannot be controlled. SP-STM measurements on a Cr/MgO(001) sample confirm this conclusion.
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68.55.-a Thin film structure and morphology
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Large amplitude magnetization dynamics and the suppression of edge modes in a single nanomagnet

P. S. Keatley, P. Gangmei, M. Dvornik, R. J. Hicken, J. R. Childress, and J. A. Katine

Appl. Phys. Lett. 98, 082506 (2011); http://dx.doi.org/10.1063/1.3560457 (3 pages) | Cited 3 times

Online Publication Date: 25 February 2011

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Large amplitude magnetization dynamics of a single square nanomagnet have been studied by time-resolved Kerr microscopy. Experimental spectra revealed that only a single mode was excited for all bias field values. Micromagnetic simulations demonstrate that at larger pulsed field amplitudes the center mode dominates the dynamic response while the edge mode is almost completely suppressed. Controlled suppression of edge modes in a single nanomagnet has potential applications in the operation of nanoscale spin transfer torque oscillators and bistable switching devices for which the amplitude of the magnetization trajectory is often large and a more uniform dynamic response is desirable.
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75.75.-c Magnetic properties of nanostructures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.47.D- Time resolved spectroscopy (>1 psec)
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