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15 Jun 2009

Volume 94, Issue 24, Articles (24xxxx)

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Appl. Phys. Lett. 94, 241101 (2009); http://dx.doi.org/10.1063/1.3153146 (3 pages)

G. Walter, C. H. Wu, H. W. Then, M. Feng, and N. Holonyak, Jr.
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Magnetic properties of a dc metamaterial consisting of parallel square superconducting thin plates

Carles Navau, Du-Xing Chen, Alvaro Sanchez, and Nuria Del-Valle

Appl. Phys. Lett. 94, 242501 (2009); http://dx.doi.org/10.1063/1.3154555 (3 pages) | Cited 8 times

Online Publication Date: 15 June 2009

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Cloaking a static magnetic field is becoming a real possibility after the recently proposed concept of dc metamaterials. Here, we present, by a model based on superconductivity first principles, accurate and systematic calculations for the susceptibility of a dc metamaterial consisting of parallel square superconducting thin plates. Since both magnetic and kinetic energies are considered, our model takes into account the effect of a penetration depth in the superconductors and therefore can be applied for high-temperature superconductors. Thus, from the calculated results, a device that can cloak a static magnetic field may be constructed based on high-temperature superconducting thin films.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
74.20.-z Theories and models of superconducting state
42.70.-a Optical materials
74.78.-w Superconducting films and low-dimensional structures

A first principles study on the full-Heusler compound Cr2MnAl

Jia Li, Yangxian Li, Guoxiang Zhou, Yubao Sun, and Chang Q. Sun

Appl. Phys. Lett. 94, 242502 (2009); http://dx.doi.org/10.1063/1.3156811 (3 pages) | Cited 5 times

Online Publication Date: 16 June 2009

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The Hg2CuTi-type structure is found to be preferable energy wise than the Cu2MnAl-type structure for full-Heusler Cr2MnAl and exhibits half-metallic ferromagnetism based on first principles. The calculations for the mixed compounds with disorder between B and D sublattices reveal that the case of exchanging one atom maintains the half-metallicity while the case of exchanging two atoms loses it. The electronic structures of the atoms at sites A or C are affected mainly by the nearest-neighboring coordination while that of the atoms at site B are determined by the next-nearest-neighboring coordination.
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71.15.-m Methods of electronic structure calculations
61.66.Dk Alloys
71.20.Be Transition metals and alloys
75.50.Cc Other ferromagnetic metals and alloys

Disentangling strain effects in manganite heterostructures

A. Tebano, A. Orsini, P. G. Medaglia, and G. Balestrino

Appl. Phys. Lett. 94, 242503 (2009); http://dx.doi.org/10.1063/1.3155136 (3 pages) | Cited 5 times

Online Publication Date: 16 June 2009

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Understanding the physical behavior of an interface between two different oxides is made difficult because of the many competing physical mechanisms such as epitaxial strain, broken symmetry, elemental interdiffusion, and polarity discontinuity, which may be at play simultaneously. We propose an approach, based on heterostructures engineering, to single out the effect of the epitaxial strain from the other physical-chemical effects at the interface between the substrate and the La07Sr0.3MnO3 film. It was found that the degradation of magnetotransport properties, reported for relatively thick films, is a consequence of epitaxial strain alone and is not affected by interface chemistry.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Ak Magnetic properties of monolayers and thin films
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.47.Lx Magnetic oxides
75.50.Ee Antiferromagnetics
68.35.Gy Mechanical properties; surface strains
75.50.Dd Nonmetallic ferromagnetic materials

Bistable Abrikosov vortex diode made of a Py–Nb ferromagnet-superconductor bilayer structure

G. Carapella, V. Granata, F. Russo, and G. Costabile

Appl. Phys. Lett. 94, 242504 (2009); http://dx.doi.org/10.1063/1.3155424 (3 pages) | Cited 5 times

Online Publication Date: 16 June 2009

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We report magnetotransport measurements on Py/Nb bilayers patterned in a Hall strip geometry, with Permalloy allowing a weak stripe domain regime. After application of a weak magnetic field in the plane of the bilayer perpendicular to the transport current, the strip behaves as a bistable superconducting diode and a nonvolatile superconducting valve as well. The observed behavior can be accounted for by the stray fields at the edges of the strip that modulate the distribution of the stray fields from the stripe domains in the ferromagnetic layer, generating an asymmetric and bistable magnetic forces background for the Abrikosov vortices moving in the superconducting layer.
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85.25.-j Superconducting devices
85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

Suppression of superconductivity in FeSe films under tensile strain

Y. F. Nie, E. Brahimi, J. I. Budnick, W. A. Hines, M. Jain, and B. O. Wells

Appl. Phys. Lett. 94, 242505 (2009); http://dx.doi.org/10.1063/1.3155441 (3 pages) | Cited 25 times

Online Publication Date: 16 June 2009

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We have studied the effect of tensile strain on the superconductivity in FeSe films. 50, 100, and 200 nm FeSe films were grown on MgO, SrTiO3, and LaAlO3 substrates by using a pulsed laser deposition technique. X-ray diffraction analysis showed that the tetragonal phase is dominant in all of our FeSe films. The 50 nm FeSe films on MgO and SrTiO3 are under tensile strain, while the 50 nm FeSe film on LaAlO3 and the other thick FeSe films are unstrained. Superconducting transitions have been observed in unstrained FeSe films with Tonset ≈ 8 K, which is close to the bulk value. However, no sign of superconductivity has been observed in FeSe films under tensile strain down to 5 K. This is evidence to show that tensile strain suppresses superconductivity in FeSe films.
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74.78.-w Superconducting films and low-dimensional structures
81.15.Fg Pulsed laser ablation deposition
74.62.-c Transition temperature variations, phase diagrams
74.25.Ld Mechanical and acoustical properties, elasticity, and ultrasonic attenuation

Experimental investigation of electric and magnetic responses in composites with dielectric resonator inclusions at microwave frequencies

T. Giannakopoulou, D. Niarchos, and C. Trapalis

Appl. Phys. Lett. 94, 242506 (2009); http://dx.doi.org/10.1063/1.3156001 (3 pages) | Cited 3 times

Online Publication Date: 17 June 2009

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Composites with ferroelectric cubic inclusions are experimentally investigated with coaxial line technique in the microwave frequency range 1–18 GHz. The composites exhibit dispersive effective magnetic and dielectric properties. Strengthening of magnetic resonances with the increase in the inclusions’ number is observed. Electric resonances are damped out significantly due to material losses. The measurement results agree well with theoretical calculations based on Mie theory and Maxwell–Garnett mixing relation. Even number and symmetric arrangement of the inclusions are needed to receive true measurement image in the whole investigated range. Composites utilizing dielectric resonators are attractive in electromagnetic metamaterials fabrication.
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77.65.Fs Electromechanical resonance; quartz resonators
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
77.22.Ch Permittivity (dielectric function)
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Enhanced exchange anisotropy between antiferromagnetic PtMn and ferromagnetic Co system by AuCu underlayer

Susumu Soeya

Appl. Phys. Lett. 94, 242507 (2009); http://dx.doi.org/10.1063/1.3156860 (3 pages) | Cited 2 times

Online Publication Date: 19 June 2009

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The introduction of a Au50Cu50 (in at. %) seed and dynamic-stress-induced Pt50Mn50 ordered-assisting layer into PtMn/Co exchange-coupled films resulted in a unidirectional anisotropy constant Ke≒0.37 erg/cm2, approximately 20% larger than the previous reported results and in a strong PtMn(111) crystalline orientation even after thermal annealing. It was considered that the former was due to the increase in exchange-coupling density with the strong PtMn(111) orientation and to the increase in lattice distortion of the PtMn film with excessive dynamic-stress-induced PtMn ordered-assisting effect of the AuCu film. The cause of the latter was that the AuCu film effectively functioned as a seed layer of the PtMn film.
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75.30.Gw Magnetic anisotropy
81.40.Gh Other heat and thermomechanical treatments
75.50.Ee Antiferromagnetics
75.50.Cc Other ferromagnetic metals and alloys
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Ak Magnetic properties of monolayers and thin films
81.15.Cd Deposition by sputtering
68.55.jd Thickness
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