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25 Nov 2002

Volume 81, Issue 22, pp. 4103-4293

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Synthesis and atomic-level characterization of Ni nanoparticles in Al2O3 matrix

D. Kumar, S. J. Pennycook, A. Lupini, G. Duscher, A. Tiwari, and J. Narayan

Appl. Phys. Lett. 81, 4204 (2002); http://dx.doi.org/10.1063/1.1525052 (3 pages) | Cited 15 times

Online Publication Date: 19 November 2002

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Single domain magnetic nickel nanocrystals were embedded in alumina matrix using a pulsed-laser deposition technique. Structural characterization carried out at the atomic level using scanning transmission electron microscopy with atomic number contrast (STEM-Z) in conjunction with electron energy loss spectroscopy have revealed that the Ni particles are well separated and have interfaces with the host matrix that are atomically sharp and free of any oxide layer. An excellent correlation was found between particle sizes determined theoretically from magnetization versus field data and experimentally using STEM-Z which indicates the absence of any magnetically dead layers on the Ni nanoparticles within an experimental error of 0.1 monolayer. © 2002 American Institute of Physics.
Show PACS
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.60.Ch Domain walls and domain structure
79.20.Uv Electron energy loss spectroscopy
75.50.Tt Fine-particle systems; nanocrystalline materials
81.15.Fg Pulsed laser ablation deposition
68.55.-a Thin film structure and morphology
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Procedure to induce a persistent current in superconducting cylinders or rings

H. González-Jorge, J. Peleteiro, E. Carballo, L. Romaní, and G. Domarco

Appl. Phys. Lett. 81, 4207 (2002); http://dx.doi.org/10.1063/1.1525057 (2 pages) | Cited 5 times

Online Publication Date: 19 November 2002

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A procedure to induce a persistent current in superconducting cylinders or rings was developed using a coil and a ferromagnetic core. Using the field cooling method, the current is induced from the combined effect of the coil magnetic field and the core magnetization. The proposed method was checked using four Bi-2223 samples. The main usefulness seems to be that a high persistent current can be induced using small both probe currents and coils. © 2002 American Institute of Physics.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
74.25.Ha Magnetic properties including vortex structures and related phenomena
74.72.-h Cuprate superconductors

Effects of Co-doping level on the microstructural and ferromagnetic properties of liquid-delivery metalorganic-chemical-vapor-deposited Ti1−xCoxO2 thin films

Nak-Jin Seong, Soon-Gil Yoon, and Chae-Ryong Cho

Appl. Phys. Lett. 81, 4209 (2002); http://dx.doi.org/10.1063/1.1525397 (3 pages) | Cited 35 times

Online Publication Date: 19 November 2002

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Polycrystalline Ti1−xCoxO2 thin films on SiO2 (200 nm)/Si (100) substrates were prepared using liquid-delivery metalorganic chemical vapor deposition, and the microstructure and ferromagnetic properties were investigated as a function of doped Co concentration. Ferromagnetic behaviors of polycrystalline films were observed at room temperature, and the magnetic and structural properties strongly depended on the Co distribution, which varied widely with doped Co concentration. The annealed Ti1−xCoxO2 thin films with x ⩽ 0.05 showed a homogeneous structure without any clusters, and pure ferromagnetic properties of thin films are only attributed to the Ti1−xCoxO2 (TCO) phases. On the other hand, in case of thin films above x = 0.05, Co1−xTix clusters having a soft magnetic (SM) property formed in a homogeneous Ti1−xCoxO2 phase, and the overall ferromagnetic (FM) properties depended on both FMTCO and SMCo–Ti. Co1−xTix clusters with about 150 nm size decreased the value of Hc (coercive field) and increased the saturation magnetic field. © 2002 American Institute of Physics.
Show PACS
75.70.Ak Magnetic properties of monolayers and thin films
68.55.-a Thin film structure and morphology
75.50.Pp Magnetic semiconductors
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
75.30.Hx Magnetic impurity interactions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Dd Nonmetallic ferromagnetic materials
68.55.A- Nucleation and growth

A key to room-temperature ferromagnetism in Fe-doped ZnO: Cu

S-J. Han, J. W. Song, C.-H. Yang, S. H. Park, J.-H. Park, Y. H. Jeong, and K. W. Rhie

Appl. Phys. Lett. 81, 4212 (2002); http://dx.doi.org/10.1063/1.1525885 (3 pages) | Cited 144 times

Online Publication Date: 19 November 2002

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Successful synthesis of room-temperature ferromagnetic semiconductors, Zn1−xFexO, is reported. The essential ingredient in achieving room-temperature ferromagnetism in bulk Zn1−xFexO was found to be additional Cu doping. A transition temperature as high as 550 K was obtained in Zn0.94Fe0.05Cu0.01O; the saturation magnetization at room temperature reached a value of 0.75μB per Fe. A large magnetoresistance was also observed below 100 K. © 2002 American Institute of Physics.
Show PACS
75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
72.80.Ey III-V and II-VI semiconductors
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
72.20.My Galvanomagnetic and other magnetotransport effects
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