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22 Jun 2009

Volume 94, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 94, 251101 (2009); http://dx.doi.org/10.1063/1.3153276 (3 pages)

Changling Yan, Qi Jie Wang, Laurent Diehl, Martina Hentschel, Jan Wiersig, Nanfang Yu, Christian Pflügl, Federico Capasso, Mikhail A. Belkin, Tadataka Edamura, Masamichi Yamanishi, and Hirofumi Kan
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Synthesis and magnetic properties of Al doped Zn0.995Mn0.005O powers

Xiang Li, Zhou Yu, Xue Long, Pengtin Lin, Xingwang Cheng, Ying Liu, Chuanbao Cao, Hongwei Zhang, Guangheng Wu, and Richeng Yu

Appl. Phys. Lett. 94, 252501 (2009); http://dx.doi.org/10.1063/1.3159469 (3 pages) | Cited 2 times

Online Publication Date: 22 June 2009

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Chemical method was employed to synthesize Mn and Al codoped ZnO, namely, Zn0.995−xMn0.005AlxO with the nominal composition of x = 0, 0.005, and 0.02. Structural, optical, and magnetic properties of the produced samples were studied. The results indicated that introduce Al as additional dopants induces in an enhancement of the ferromagnetism in Zn0.995Mn0.005O. The enhanced ferromagnetism (FM) in (Mn,Al) codoped sample can be understood in view of that introducing of Al could promote spinodal decomposition and lead to Mn rich regions. The Mn rich regions could be responsibility for the observed enhancement of FM at room temperature.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
61.72.uj III-V and II-VI semiconductors
61.43.Gt Powders, porous materials
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Pp Magnetic semiconductors

Dual-function phase shifter for spin-wave logic applications

Ulf-Hendrik Hansen, Vladislav E. Demidov, and Sergej O. Demokritov

Appl. Phys. Lett. 94, 252502 (2009); http://dx.doi.org/10.1063/1.3159628 (3 pages) | Cited 4 times

Online Publication Date: 22 June 2009

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We have studied experimentally the linear and nonlinear control over the phase accumulation in a spin-wave phase shifter, which is a key element for construction of spin-wave logic devices. The linear control is realized by creation of a local inhomogeneity of the bias magnetic field, whereas the nonlinear control is based on the shift in the spin-wave dispersion spectrum with the increase in the spin-wave amplitude. We show that in a single device these two mechanisms can have comparable efficiencies and relatively small cross talk, which allows their simultaneous use for realization of dual-argument logic operations.
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84.30.Qi Modulators and demodulators; discriminators, comparators, mixers, limiters, and compressors

Enhancement in tunnel magnetoresistance effect by inserting CoFeB to the tunneling barrier interface in Co2MnSi/MgO/CoFe magnetic tunnel junctions

S. Tsunegi, Y. Sakuraba, M. Oogane, Hiroshi Naganuma, K. Takanashi, and Y. Ando

Appl. Phys. Lett. 94, 252503 (2009); http://dx.doi.org/10.1063/1.3156858 (3 pages) | Cited 11 times

Online Publication Date: 22 June 2009

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Tunnel magnetoresistance (TMR) effect was investigated in Co2MnSi/CoFeB(0–2 nm)/MgO/CoFe magnetic tunnel junctions (MTJs). TMR ratio was enhanced by inserting a thin CoFeB layer at the Co2MnSi/MgO interface. The MTJ with CoFeB thickness of 0.5 nm exhibited the highest TMR ratio. From the conductance-voltage measurements for the fabricated MTJs, we infer that the highly spin polarized electron created in Co2MnSi can conserve the polarization through the 0.5-nm-thick CoFeB layer. Furthermore, by insertion of the thin CoFeB layer, the temperature dependence of the TMR ratio was improved because of the suppression of the fluctuation of the magnetic moment at the Co2MnSi/MgO interface.
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75.47.Pq Other materials
75.30.Cr Saturation moments and magnetic susceptibilities
72.25.Mk Spin transport through interfaces
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)

Exchange bias in zinc-blende CrTe–MnTe bilayer

J. F. Bi, H. Lu, M. G. Sreenivasan, and K. L. Teo

Appl. Phys. Lett. 94, 252504 (2009); http://dx.doi.org/10.1063/1.3157841 (3 pages) | Cited 2 times

Online Publication Date: 22 June 2009

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We have studied the exchange bias at the ferromagnetic (FM)/antiferromagnetic interface in the zinc-blende transition-metal chalcogenides, CrTe (5 nm)/MnTe(40 nm) bilayer grown on GaAs (100) substrate by molecular-beam epitaxy. A negative exchange bias shift in the hysteresis loop is observed when the bilayer is cooled in the applied magnetic field. The temperature-dependent remanent magnetization shows a clear enhancement of the Curie temperature and magnetization in the bilayer as compared to a single FM layer. The effects of temperature, cooling field, and angular dependence on the exchange bias have been investigated.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Et Exchange and superexchange interactions
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Ee Antiferromagnetics
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Electron doping and magnetic moment formation in N- and C-doped MgO

A. Droghetti and S. Sanvito

Appl. Phys. Lett. 94, 252505 (2009); http://dx.doi.org/10.1063/1.3152781 (3 pages) | Cited 26 times

Online Publication Date: 22 June 2009

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The formation of the magnetic moment in C- and N-doped MgO is the result of a delicate interplay between Hund’s coupling, hybridization, and Jahn–Teller distortion. The balance depends on a number of environmental variables including electron doping. We investigate such a dependence by self-interaction corrected density functional theory and we find that the moment formation is robust with respect to electron doping. In contrast, the local symmetry around the dopant is more fragile and different geometries can be stabilized. Crucially the magnetic moment is always extremely localized, making any carrier mediated picture of magnetism in d0 magnets unlikely.
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75.30.Cr Saturation moments and magnetic susceptibilities
71.15.Mb Density functional theory, local density approximation, gradient and other corrections
61.72.up Other materials
71.20.Ps Other inorganic compounds

Effect of uniaxial pressure on metal-insulator transition in (Sm1−yNdy)0.52Sr0.48MnO3 single crystals

A. Murugeswari, P. Sarkar, S. Arumugam, N. Manivannan, P. Mandal, T. Ishida, and S. Noguchi

Appl. Phys. Lett. 94, 252506 (2009); http://dx.doi.org/10.1063/1.3160019 (3 pages) | Cited 2 times

Online Publication Date: 25 June 2009

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We have investigated the effect of uniaxial pressure (P) on resistivity along the ab plane and c-axis in single crystals of (Sm1−yNdy)0.52Sr0.48MnO3 with y = 0, 0.05, and 0.3. The application of pressure along the c-axis shifts the metal-insulator transition (MIT) to higher temperature, while MIT temperature decreases with P when it is applied perpendicular to the c-axis. This behavior is quite different from that observed in hydrostatic pressure and can be explained by considering the P dependence change in equatorial and apical Mn–O–Mn bond angles.
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71.30.+h Metal-insulator transitions and other electronic transitions
75.50.Dd Nonmetallic ferromagnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
61.66.Fn Inorganic compounds
72.80.Sk Insulators
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Anomalous, hysteretic, transverse magnetoresistance in superconducting thin films with magnetic vortex arrays

J. E. Villegas, A. Sharoni, C.-P. Li, and Ivan K. Schuller

Appl. Phys. Lett. 94, 252507 (2009); http://dx.doi.org/10.1063/1.3159466 (3 pages) | Cited 3 times

Online Publication Date: 26 June 2009

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We have studied a superconducting/ferromagnetic hybrid system in which the normal to superconducting phase transition is controlled by the magnetic history. An anomalous transverse resistance appears at the phase transition, which shows magnetic hysteresis and a strong current dependence. We show that the anomaly originates from current redistributions due to the inhomogeneous superconductivity of this system.
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74.78.-w Superconducting films and low-dimensional structures
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
74.62.Yb Other effects
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