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3 Feb 2003

Volume 82, Issue 5, pp. 665-834

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Appl. Phys. Lett. 82, 775 (2003); http://dx.doi.org/10.1063/1.1541091 (3 pages)

Sebastiaan van Dijken, Xin Jiang, and Stuart S. P. Parkin
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Magnetoelastic and thermoelastic shape memory effect in a Co–Ni single crystal

W. M. Zhou, Y. Liu, B. H. Jiang, X. Qi, and Y. N. Liu

Appl. Phys. Lett. 82, 760 (2003); http://dx.doi.org/10.1063/1.1539907 (3 pages) | Cited 10 times

Online Publication Date: 28 January 2003

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This letter reports on a study of the magnetomechanical and thermomechanical behavior of a Co–32Ni single crystal. When magnetized along the [001]fcc direction at room temperature in austenite coexited with martensitic state, field-induced strains as high as 4.2% were measured at a field of 12 kOe. The magnetic field-induced strains were recovered during demagnetization, exhibiting a magnetic hysteresis of 5–6 kOe. No field-induced strain was detected if a magnetic field was loaded along another direction. When deformed in compression along the [001]fcc direction at room temperature to a prestrain of 5.4%, about 1.5% strain was recovered during subsequent heating, yielding a recovery rate of 27.8%. For specimens deformed in other crystal directions, no obvious recoverable strain was measured. These experimental phenomena are discussed and interpreted in terms of reversible motions of Shockley partial dislocations. © 2003 American Institute of Physics.
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75.80.+q Magnetomechanical effects, magnetostriction
75.50.Cc Other ferromagnetic metals and alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
61.72.Hh Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.)
62.20.F- Deformation and plasticity
81.40.Lm Deformation, plasticity, and creep
81.40.Gh Other heat and thermomechanical treatments
61.72.Lk Linear defects: dislocations, disclinations
66.30.Lw Diffusion of other defects

Blocking phenomena in granular magnetic alloys through magnetization, Hall effect, and magnetoresistance experiments

J. C. Denardin, A. B. Pakhomov, A. L. Brandl, L. M. Socolovsky, M. Knobel, and X. X. Zhang

Appl. Phys. Lett. 82, 763 (2003); http://dx.doi.org/10.1063/1.1542678 (3 pages) | Cited 10 times

Online Publication Date: 28 January 2003

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Magnetization and magnetotransport were measured in CoxAg1−x granular composites as a function of temperature and applied magnetic field. A transition from blocked to superparamagnetic behavior with increasing temperatures can be observed in magnetization, giant magnetoresistance and the extraordinary Hall effect measurements. However, the blocking temperature determined from magnetotransport measurements is systematically lower than the one estimated from magnetic measurements. This is due to the selective magnetic scattering, which is enhanced for smaller particles, while the magnetization probes the whole particle size distribution. © 2003 American Institute of Physics.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.47.De Giant magnetoresistance
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.05.Rm Porous materials; granular materials
72.15.Gd Galvanomagnetic and other magnetotransport effects

Electronic and magnetic properties of MnN versus MnAs

A. Janotti, Su-Huai Wei, and Laurent Bellaiche

Appl. Phys. Lett. 82, 766 (2003); http://dx.doi.org/10.1063/1.1542672 (3 pages) | Cited 28 times

Online Publication Date: 28 January 2003

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Electronic and magnetic properties of MnN and MnAs compounds in the hypothetical cubic zinc-blende phase are studied using first-principles band structure method. We show that the high electronegativity and small atomic size of N compared to As lead to interesting consequences: MnN has a low-spin antiferromagnetic ground state, whereas MnAs has a high-spin hole mediated ferromagnetic (FM) ground state. Because the Mn d bands are higher in energy than the N p band, Mn is not efficient to generate free holes in the nitrides. Therefore, previous prediction that undoped Ga1−xMnxN diluted alloy can result in room-temperature FM semiconductor should be reexamined. © 2003 American Institute of Physics.
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71.20.Nr Semiconductor compounds
75.40.Mg Numerical simulation studies
75.50.Ee Antiferromagnetics
75.50.Dd Nonmetallic ferromagnetic materials
75.10.Lp Band and itinerant models
75.50.Pp Magnetic semiconductors

Junction parameter control of Bi2Sr2CaCu2O8+δ stacked junctions by annealing

K. Inomata, T. Kawae, K. Nakajima, S.-J. Kim, and T. Yamashita

Appl. Phys. Lett. 82, 769 (2003); http://dx.doi.org/10.1063/1.1542679 (3 pages) | Cited 13 times

Online Publication Date: 28 January 2003

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The control of the critical current density (Jc) and the junction resistance (RN) along the c axis of intrinsic Josephson junctions (IJJs) on a high-Tc superconductor is very important for applying the IJJs to electronic devices. For controlling these junction parameters, we have clarified the relationship of Jc, RN, and the carrier density in Bi2Sr2CaCu2O8+δ (Bi-2212) whiskers by changing the carrier density with an annealing process. As a result, the Jc decreased, and the RN increased systematically when the carrier density decreased. The values of Jc and RN could be controlled by a change in the carrier density. © 2003 American Institute of Physics.
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74.72.-h Cuprate superconductors
74.50.+r Tunneling phenomena; Josephson effects
74.25.Sv Critical currents
74.25.F- Transport properties
81.40.Gh Other heat and thermomechanical treatments
81.40.Rs Electrical and magnetic properties related to treatment conditions

Ca-doping-induced enhancement of the critical currents of coated conductors grown by ion-beam-assisted deposition

A. Weber, G. Hammerl, A. Schmehl, C. W. Schneider, J. Mannhart, B. Schey, M. Kuhn, R. Nies, B. Utz, and H.-W. Neumueller

Appl. Phys. Lett. 82, 772 (2003); http://dx.doi.org/10.1063/1.1543640 (3 pages) | Cited 10 times

Online Publication Date: 28 January 2003

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One of the most promising technologies for the fabrication of high-Tc cables is the ion-beam-assisted deposition (IBAD) technique. The performance of the superconductors fabricated by IBAD, and the fabrication costs, are to a great extent determined by the critical current densities of the superconductors’ grain boundaries. Since, in bicrystalline samples, overdoping has been found to improve the transport properties of grain boundaries in high-Tc superconductors, we have explored whether overdoping also enhances the critical currents of IBAD samples. The measurements show that, depending on the critical current density of the superconducting film, Jc (77 K) is increased by factors up to 2.2, also in applied magnetic fields of several tesla. © 2003 American Institute of Physics.
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74.25.Sv Critical currents
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
81.15.Jj Ion and electron beam-assisted deposition; ion plating
84.71.Mn Superconducting wires, fibers, and tapes

Comparison of magnetocurrent and transfer ratio in magnetic tunnel transistors with spin-valve bases containing Cu and Au spacer layers

Sebastiaan van Dijken, Xin Jiang, and Stuart S. P. Parkin

Appl. Phys. Lett. 82, 775 (2003); http://dx.doi.org/10.1063/1.1541091 (3 pages) | Cited 20 times

Online Publication Date: 28 January 2003

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The magnetocurrent of magnetic tunnel transistors with spin-valve base structures is found to be nearly insensitive to whether the spacer layer material in the spin valve is Cu or Au. By contrast, the in-plane magnetoresistance of the same spin valves differs by almost a factor of two. Furthermore, the transfer ratio of the transistor structure is an order of magnitude lower for Au compared to Cu spacer layers. We attribute these different behaviors to the significant role of spin-dependent interface scattering for electrons near the Fermi energy but to much weaker such scattering for hot electrons in the energy range considered ( ∼ 1–2 eV). © 2003 American Institute of Physics.
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85.75.Dd Magnetic memory using magnetic tunnel junctions
75.47.De Giant magnetoresistance
72.25.Mk Spin transport through interfaces
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Flux pinning enhancement in ferromagnetic and superconducting thin-film multilayers

D. B. Jan, J. Y. Coulter, M. E. Hawley, L. N. Bulaevskii, M. P. Maley, Q. X. Jia, B. B. Maranville, F. Hellman, and X. Q. Pan

Appl. Phys. Lett. 82, 778 (2003); http://dx.doi.org/10.1063/1.1542674 (3 pages) | Cited 31 times

Online Publication Date: 28 January 2003

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Flux pinning in high-temperature superconductors such as YBa2Cu3O7−x (YBCO) in the past has been accomplished by pinning the vortex cores. We demonstrate magnetic-domain-induced flux pinning of the magnetic flux of vortices in a ferromagnet-superconductor bilayer consisting of CoPt grown on YBCO, where the ferromagnet has uniaxial perpendicular magnetic anisotropy and a random domain structure. We observe an improvement of the critical current due to magnetic pinning at temperatures close to the transition temperature. © 2003 American Institute of Physics.
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74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
75.50.Cc Other ferromagnetic metals and alloys
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Gw Magnetic anisotropy
75.70.Kw Domain structure (including magnetic bubbles and vortices)
74.25.Sv Critical currents
74.40.-n Fluctuation phenomena
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