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5 Mar 2012

Volume 100, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 100, 101903 (2012); http://dx.doi.org/10.1063/1.3673327 (3 pages)

Michael Ian Lapsley, Anaram Shahravan, Qingzhen Hao, Bala Krishna Juluri, Stephen Giardinelli, Mengqian Lu, Yanhui Zhao, I-Kao Chiang, Themis Matsoukas, and Tony Jun Huang
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Thermal stability of patterned Co/Pd nanodot arrays

I. Tudosa, Marko V. Lubarda, K. T. Chan, M. A. Escobar, Vitaliy Lomakin, and E. E. Fullerton

Appl. Phys. Lett. 100, 102401 (2012); http://dx.doi.org/10.1063/1.3692574 (4 pages) | Cited 2 times

Online Publication Date: 5 March 2012

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We have studied the magnetic reversal and thermal stability of [Co(0.3 nm)/Pd(0.7 nm)]N multilayers patterned into 35-nm-diameter nanodot arrays. The short-time coercive fields are relatively constant with N while the room-temperature thermal stability parameter increases nearly linearly with N. However the magnetic switching volume extracted from the thermal stability is significantly less than the physical volume of the samples. The experimental results are in quantitative agreement with micromagnetic modeling, which indicates that reversal and thermal stability is controlled by nucleation and propagation of edge domains.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Ak Magnetic properties of monolayers and thin films
68.60.Dv Thermal stability; thermal effects
75.50.Tt Fine-particle systems; nanocrystalline materials
75.75.-c Magnetic properties of nanostructures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Thermally induced error: Density limit for magnetic data storage

R. F. L. Evans, R. W. Chantrell, U. Nowak, A. Lyberatos, and H.-J. Richter

Appl. Phys. Lett. 100, 102402 (2012); http://dx.doi.org/10.1063/1.3691196 (3 pages) | Cited 4 times

Online Publication Date: 6 March 2012

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Magnetic data storage is pervasive in the preservation of digital information, and the rapid pace of computer development requires ever more capacity. Increasing the storage density for magnetic hard disk drives requires a reduced bit size, previously thought to be limited by the thermal stability of the constituent magnetic grains. The limiting storage density in magnetic recording is investigated treating the writing of bits as a thermodynamic process. A “thermal writability” factor is introduced and it is shown that storage densities will be limited to 15 to 20 TBit/in2 unless technology can move beyond the currently available write field magnitudes.
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85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)

Direct measurement of the three-dimensional magnetization vector trajectory in GaMnAs by a magneto-optical pump-and-probe method

N. Tesařová, P. Němec, E. Rozkotová, J. Šubrt, H. Reichlová, D. Butkovičová, F. Trojánek, P. Malý, V. Novák, and T. Jungwirth

Appl. Phys. Lett. 100, 102403 (2012); http://dx.doi.org/10.1063/1.3692599 (4 pages) | Cited 2 times

Online Publication Date: 7 March 2012

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We report on a quantitative experimental determination of the three-dimensional magnetization vector trajectory in GaMnAs by means of the static and time-resolved pump-and-probe magneto-optical measurements. The experiments are performed in a normal incidence geometry and the time evolution of the magnetization vector is obtained without any numerical modeling of magnetization dynamics. Our experimental method utilizes different polarization dependences of the polar Kerr effect and magnetic linear dichroism to disentangle the pump-induced out-of-plane and in-plane motions of magnetization, respectively. We demonstrate that the method is sensitive enough to allow for the determination of small angle excitations of the magnetization in GaMnAs. The method is readily applicable to other magnetic materials with sufficiently strong circular and linear magneto-optical effects.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.78.-n Magnetization dynamics
78.20.Ls Magneto-optical effects
78.20.Fm Birefringence
75.50.Pp Magnetic semiconductors

Nonlinearly generated harmonic signals in ultra-small waveguides with magnetic films: Tunable enhancements of 2nd and 4th harmonics

J. Marsh, V. Zagorodnii, Z. Celinski, and R. E. Camley

Appl. Phys. Lett. 100, 102404 (2012); http://dx.doi.org/10.1063/1.3688036 (3 pages)

Online Publication Date: 8 March 2012

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The nonlinear generation of high harmonic signals (up to 5th harmonic) is explored in an ultra-small waveguide which contains a thin ferromagnetic film. The strength of the different harmonics is highly tunable. In particular, the power in the 2nd and 4th harmonic signals may be enhanced by over two orders of magnitude by varying the direction of a static magnetic field with respect to the long axis of the waveguide. In contrast, the 3rd and 5th harmonics are relatively insensitive to the direction of the magnetic field. The experimental results are explained by analytical and numerical calculations.
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42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.65.Wi Nonlinear waveguides
85.70.Sq Magnetooptical devices
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