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3 May 2010

Volume 96, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 96, 183102 (2010); http://dx.doi.org/10.1063/1.3419932 (3 pages)

Bernard Aufray, Abdelkader Kara, Sébastien Vizzini, Hamid Oughaddou, Christel Léandri, Benedicte Ealet, and Guy Le Lay
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Giant magnetoelectric coefficients in (Fe90Co10)78Si12B10-AlN thin film composites

Henry Greve, Eric Woltermann, Hans-Joachim Quenzer, Bernhard Wagner, and Eckhard Quandt

Appl. Phys. Lett. 96, 182501 (2010); http://dx.doi.org/10.1063/1.3377908 (3 pages) | Cited 43 times

Online Publication Date: 3 May 2010

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Thin film magnetoelectric (ME) two–two composites consisting of AlN and amorphous (Fe90Co10)78Si12B10 layers were fabricated by magnetron sputtering on Si (100) substrates. Upon magnetic field annealing they show an extremely high ME coefficient of 737 V/cm Oe at mechanical resonance at 753 Hz and 3.1 V/cm Oe out of resonance at 100 Hz. These are the highest reported ME coefficients in thin film composites ever. Furthermore, the induced magnetic anisotropy by field annealing serves the possibility to obtain a sensor element with a pronounced sensitivity in only one dimension, which allows the realization of a three-dimensional vector field sensor.
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75.85.+t Magnetoelectric effects, multiferroics
77.55.Nv Multiferroic/magnetoelectric films
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
85.75.Ss Magnetic field sensors using spin polarized transport
75.30.Gw Magnetic anisotropy
75.60.Nt Magnetic annealing and temperature-hysteresis effects

Microstructure and ferromagnetic property in CaRuO3 thin films with pseudoheterostructure

Y. B. Chen, Jian Zhou, Fei-xiang Wu, Wei-jing Ji, Shan-Tao Zhang, Yan-Feng Chen, and Yong-Yuan Zhu

Appl. Phys. Lett. 96, 182502 (2010); http://dx.doi.org/10.1063/1.3422476 (3 pages) | Cited 2 times

Online Publication Date: 4 May 2010

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CaRuO3 thin films were synthesized on SrTiO3 substrates by pulsed laser deposition. Detailed microstructure analysis by transmission electron microscopy revealed the pseudoheterostructure in CaRuO3 films. It consists of a coherently strained cubic CaRuO3 layer contacted with substrate, as well as a strained orthorhombic CaRuO3 layer. The orthorhombic CaRuO3 layer is composed of two types of domains. The ferromagnetic property of the pseudoheterostructure CaRuO3 was revealed by superconducting quantum interference device measurement. This is due to the cubic CaRuO3 layer, which is supported by first-principle calculations. The formation mechanism of pseudoheterostructure in ultrathin CaRuO3 thin films was proposed.
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68.55.-a Thin film structure and morphology
75.50.Cc Other ferromagnetic metals and alloys
75.70.-i Magnetic properties of thin films, surfaces, and interfaces

Effect of phase transformation on the converse magnetoelectric properties of a heterostructure of Ni49.2Mn29.6Ga21.2 and 0.7PbMg1/3Nb2/3O3-0.3PbTiO3 crystals

M. Zeng, Siu Wing Or, and Helen Lai Wa Chan

Appl. Phys. Lett. 96, 182503 (2010); http://dx.doi.org/10.1063/1.3427388 (3 pages) | Cited 6 times

Online Publication Date: 6 May 2010

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We report experimentally and theoretically the effect of phase transformation on the converse magnetoelectric (CME) properties of a heterostructure formed by one layer of piezoelectric 0.7PbMg1/3Nb2/3O3-0.3PbTiO3 (PMN-PT) crystal sandwiched between two layers of ferromagnetic shape memory Ni49.2Mn29.6Ga21.2 (Ni–Mn–Ga) crystal. The CME coefficient (αB) of the heterostructure remains minimally and relatively constant in the martensitic phase (<28 °C), attains its maximum value in the martensitic-austenitic phase transformation (28–39 °C), and decreases gradually with increasing temperature in the austenitic phase (>39 °C). Giant resonance αB of 18.6 G/V is found at 32 °C under a very low bias magnetic field of 150 Oe.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc Other ferromagnetic metals and alloys
64.70.K- Solid-solid transitions
75.85.+t Magnetoelectric effects, multiferroics
77.84.Cg PZT ceramics and other titanates
77.65.-j Piezoelectricity and electromechanical effects

1550 nm band optical input module with superconducting single-flux-quantum circuit

Satoshi Shinada, Hirotaka Terai, Zhen Wang, and Naoya Wada

Appl. Phys. Lett. 96, 182504 (2010); http://dx.doi.org/10.1063/1.3428370 (3 pages) | Cited 2 times

Online Publication Date: 6 May 2010

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We developed an optical input module with a superconducting single-flux-quantum (SFQ) circuit for application of ultrafast photonic networks in the near future. The optical input module, consisting of a built-in photodiode (PD) with a coplanar waveguide transmission line, was fabricated on an InP substrate and flip-chip bonded with the SFQ circuit on a Si substrate. The fabricated PD showed photosensitivities of more than 0.2 A/W for the wavelength range 1480 to 1530 nm at 4.2 K. SFQ pulses were generated by less than 1 mW optical pulse input.
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85.25.Hv Superconducting logic elements and memory devices; microelectronic circuits
84.40.Az Waveguides, transmission lines, striplines
85.60.Dw Photodiodes; phototransistors; photoresistors

Tunable 0-π transition by spin precession in Josephson junctions

Jun-Feng Liu, K. S. Chan, and J. Wang

Appl. Phys. Lett. 96, 182505 (2010); http://dx.doi.org/10.1063/1.3425764 (3 pages) | Cited 1 time

Online Publication Date: 6 May 2010

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We study the electrical control of 0-π transition in Josephson junctions with a ferromagnet/two-dimensional electron gas (2DEG)/ferromagnet coupling layer. There is Rashba spin-orbit coupling in the 2DEG and the three layer structure is a Datta–Das spin transistor. When electrons or holes travel through the 2DEG layer, their spins are rotated by the spin-orbit coupling, which is equivalent to varying the angle between the magnetizations of the two ferromagnetic layers and thus leading to a 0-π transition. We show that the 0-π transition can be fully controlled by tuning the strength of spin-orbit coupling.
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74.62.-c Transition temperature variations, phase diagrams
74.50.+r Tunneling phenomena; Josephson effects
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Influence of Co and Ni addition on the magnetocaloric effect in Fe88−2xCoxNixZr7B4Cu1 soft magnetic amorphous alloys

R. Caballero-Flores, V. Franco, A. Conde, K. E. Knipling, and M. A. Willard

Appl. Phys. Lett. 96, 182506 (2010); http://dx.doi.org/10.1063/1.3427439 (3 pages) | Cited 19 times

Online Publication Date: 7 May 2010

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We have studied the magnetocaloric effect in a series of Fe88−2xCoxNixZr7B4Cu1 alloys. The partial substitution of Fe by Co and Ni leads to a monotonic increase in the Curie temperature (TC) of the alloys from 287 K for x = 0 to 626 K for x = 11. The maximum magnetic entropy change (ΔSMpk) at an applied field of 1.5 T, shows a value of 1.98 J K−1 kg−1 for x = 8.25. The refrigerant capacity (RC) has maximum values near 166 J kg−1 (for x = 0 and 2.75). These values place the present series of alloys among the best magnetic refrigerant materials, with an RC ∼ 40% larger than Gd5Si2Ge1.9Fe0.1 and ∼ 15% larger than Fe-based amorphous alloys.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

The effect of transverse field on fast domain wall dynamics in magnetic microwires

K. Richter, R. Varga, G. A. Badini-Confalonieri, and M. Vázquez

Appl. Phys. Lett. 96, 182507 (2010); http://dx.doi.org/10.1063/1.3428367 (3 pages) | Cited 10 times

Online Publication Date: 7 May 2010

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We have studied the domain wall longitudinal propagation and its dynamics under the influence of transverse magnetic field in thin magnetic wires. A different behavior was observed for strong and weak transverse fields. In weak transverse field Ht, the domain wall dynamics depends on the direction of Ht. Transverse field applied in one direction increases the Walker limit and shifts the existence of transverse domain wall to higher axial field. Transverse magnetic field applied in opposite direction decreases the Walker limit and favors vortex domain wall even at low fields. Different behavior was obtained in strong transverse field which speeds up the domain wall velocity to its saturation value of 9 km/s independently on the orientation of transverse field.
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75.78.Fg Dynamics of domain structures
75.80.+q Magnetomechanical effects, magnetostriction
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.30.Cr Saturation moments and magnetic susceptibilities
75.60.Ch Domain walls and domain structure
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