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5 Dec 2011

Volume 99, Issue 23, Articles (23xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 233701 (2011); http://dx.doi.org/10.1063/1.3651756 (3 pages)

Melis Hazar, Robert L. Steward, Jr., Chia-Jung Chang, Cynthia J. Orndoff, Yukai Zeng, Mon-Shu Ho, Philip R. LeDuc, and Chao-Min Cheng
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Enhanced refrigerant capacity and magnetic entropy flattening using a two-amorphous FeZrB(Cu) composite

Pablo Álvarez, José L. Sánchez Llamazares, Pedro Gorria, and Jesús A. Blanco

Appl. Phys. Lett. 99, 232501 (2011); http://dx.doi.org/10.1063/1.3665941 (3 pages) | Cited 8 times

Online Publication Date: 5 December 2011

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The temperature dependence of the isothermal magnetic entropy change, ΔSM, and the magnetic field dependence of the refrigerant capacity, RC, have been investigated in a composite system xA + (1 − x)B, based on Fe87Zr6B6Cu1 (A) and Fe90Zr8B2 (B) amorphous ribbons. Under a magnetic field change of 2 T, the maximum improvement of the full-width at half maximum of ΔSM(T) curve (47% and 29%) and the RC (18% and 23%), in comparison with those of the individual alloys (A and B), is observed for x ≈ 0.5. Moreover, a flattening over 80 K in the ΔSM(T) curve around room temperature range is observed, which is a key feature for an Ericsson magnetic refrigeration cycle.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Electric field controlled magnetization rotation in exchange biased antiferromagnetic/ferromagnetic/piezoelectric composites

G. A. Lebedev, B. Viala, T. Lafont, D. I. Zakharov, O. Cugat, and J. Delamare

Appl. Phys. Lett. 99, 232502 (2011); http://dx.doi.org/10.1063/1.3665952 (3 pages) | Cited 1 time

Online Publication Date: 6 December 2011

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Electric field controlled rotation of the magnetization direction of a ferromagnet is investigated in the composite of antiferromagnetic (AF)/ferromagnetic (F)/piezoelectric (PE) layers. Usually, simple 90° magnetization switching is reported with uniaxial F/PE composites. In contrast, when considering unidirectional anisotropy in exchange-biased AF/F systems, a controllable rotation of the magnetization direction in F can be achieved. Here, we show a composite which differs by using in-plane d33 deformation mode with standard magnetic electrodes. We report the experimental evidence of magnetization continuous rotation in IrMn/CoFeB/PZT composites leading to technological impacts on memories, sensors, and microwave devices.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
77.65.Bn Piezoelectric and electrostrictive constants
75.30.Gw Magnetic anisotropy
75.50.Bb Fe and its alloys
75.50.Ee Antiferromagnetics
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Jk Magnetization reversal mechanisms

Time- and vector-resolved Kerr microscopy of hard disk writers

P. Gangmei, P. S. Keatley, W. Yu, R. J. Hicken, M. A. Gubbins, P. J. Czoschke, and R. Lopusnik

Appl. Phys. Lett. 99, 232503 (2011); http://dx.doi.org/10.1063/1.3665957 (3 pages) | Cited 1 time

Online Publication Date: 6 December 2011

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Time-resolved scanning Kerr microscopy has been used to make wafer level measurements of magnetization dynamics within the yoke and pole piece of partially built hard disk writer structures. Three Cartesian components of the vector magnetization were recorded simultaneously using a quadrant photodiode polarization bridge detector. The rise time, relaxation time, and amplitude of each component has been related to the magnetic ground state, the initial torque, and flux propagation through the yoke and pole piece. Dynamic images reveal “flux-beaming” in which the magnetization component parallel to the symmetry axis of the yoke is largest along that axis.
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85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)

Autonomous micro-magnet based systems for highly efficient magnetic separation

L. F. Zanini, N. M. Dempsey, D. Givord, G. Reyne, and F. Dumas-Bouchiat

Appl. Phys. Lett. 99, 232504 (2011); http://dx.doi.org/10.1063/1.3664092 (3 pages) | Cited 2 times

Online Publication Date: 8 December 2011

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The various forces experienced by magnetic particles pumped through microfluidic channels placed above a chessboard array of micromagnets were calculated as a function of particle size and device dimensions. A device incorporating magnetically microstructured hard magnetic NdFeB films was fabricated. Good agreement was achieved between the calculated and observed distance over which magnetic particles travel before they are trapped. Using this simple and autonomous device, mixed solutions of magnetic and non-magnetic micro-particles were separated into two distinct solutions containing a concentration of up to 99.9% and 94.5% of non-magnetic and magnetic particles, respectively.
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75.70.-i Magnetic properties of thin films, surfaces, and interfaces
75.30.-m Intrinsic properties of magnetically ordered materials
75.50.Tt Fine-particle systems; nanocrystalline materials

High-Tc and high-Jc SmFeAs(O,F) films on fluoride substrates grown by molecular beam epitaxy

Shinya Ueda, Soichiro Takeda, Shiro Takano, Akiyasu Yamamoto, and Michio Naito

Appl. Phys. Lett. 99, 232505 (2011); http://dx.doi.org/10.1063/1.3664632 (3 pages) | Cited 10 times

Online Publication Date: 8 December 2011

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Superconducting thin films of SmFeAs(O,F) were prepared by molecular beam epitaxy on fluoride substrates. In our process, F-free SmFeAsO films were grown first, and F was subsequently introduced to the films by diffusion from an overlayer of SmF3. By this simple process, record high Tc, namely, Tcon (Tcend) = 57.8 K (56.4 K) was obtained in a film on CaF2. Furthermore, the films on CaF2 showed high critical current density over 1 MA/cm2 in the self-field at 5 K. The correlation between superconductivity and epitaxial strain in SmFeAs(O,F) films is discussed.
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74.78.-w Superconducting films and low-dimensional structures
66.30.-h Diffusion in solids
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
74.25.Sv Critical currents

Electrical detection of nonlinear ferromagnetic resonance in single elliptical permalloy thin film using a magnetic tunnel junction

Chong Bi, Xin Fan, Liqing Pan, Xiaoming Kou, Jun Wu, Qinghui Yang, Huaiwu Zhang, and John Q. Xiao

Appl. Phys. Lett. 99, 232506 (2011); http://dx.doi.org/10.1063/1.3670302 (3 pages)

Online Publication Date: 9 December 2011

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A quantitative method to detect ferromagnetic resonance using magnetic tunnel junction structure has been developed. Experimental results reveal three distinct regions for single elliptical permalloy film of micrometer lateral size. Above the spin wave instability threshold, the experimental results show a linear response of the longitudinal magnetization component to the microwave field amplitude over a large range rather than a lock-up phenomenon appeared in macroscopic permalloy films and then a phase limiting behavior. The linear behavior can be described by the theoretical model describing subsidiary resonance.
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75.70.Ak Magnetic properties of monolayers and thin films
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Ds Spin waves
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Finite size versus surface effects on magnetic properties of antiferromagnetic particles

Suman Mandal, Krishnakumar S. R. Menon, S. K. Mahatha, and S. Banerjee

Appl. Phys. Lett. 99, 232507 (2011); http://dx.doi.org/10.1063/1.3668091 (4 pages) | Cited 4 times

Online Publication Date: 9 December 2011

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The observation of finite magnetic moment in antiferromagnetic materials is quite unusual and has been immensely investigated in nanoparticle systems. Here, the structural and magnetic properties of NiO particles are explored by x-ray diffraction, extended x-ray absorption fine structure, and magnetization measurements. Using similar-sized particles with different surface defect structure, we show that the observed magnetic enhancement, which is present even beyond finite-size limit, is due to the surface effects. However, the well known spin glass freezing is found to occur only in nano-regime.
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75.75.-c Magnetic properties of nanostructures
75.30.Cr Saturation moments and magnetic susceptibilities
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.70.Dm X-ray absorption spectra
75.50.Lk Spin glasses and other random magnets
75.50.Ee Antiferromagnetics
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