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17 Mar 2003

Volume 82, Issue 11, pp. 1649-1799

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 1709 (2003); http://dx.doi.org/10.1063/1.1560575 (3 pages)

Ji-Won Oh, Masahiro Yoshita, Hidefumi Akiyama, Loren N. Pfeiffer, and Ken W. West
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Point-dipole response from a magnetic force microscopy tip with a synthetic antiferromagnetic coating

Yihong Wu, Yatao Shen, Zhiyong Liu, Kebin Li, and Jinjun Qiu

Appl. Phys. Lett. 82, 1748 (2003); http://dx.doi.org/10.1063/1.1560863 (3 pages) | Cited 11 times

Online Publication Date: 10 March 2003

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A point-dipole-like magnetic force microscopy tip has been realized using an antiferromagnetically coupled synthetic structure consisting of two CoCrPt layers separated by an ultrathin Ru layer. This is made possible through magnetizing one of the CoCrPt layers in either upward or downward direction along the tip axis and the other in the opposite direction through antiferromagnetic coupling. The new tip was found to have a superior resolution and a point-dipole-like magnetic response when being used to image magnetic patterns recorded on longitudinal media. © 2003 American Institute of Physics.
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68.37.Rt Magnetic force microscopy (MFM)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Ss Magnetic recording materials
75.50.Cc Other ferromagnetic metals and alloys
75.50.Ee Antiferromagnetics

Structure and magnetic properties of high coercive NdFeB films with a perpendicular anisotropy

L. K. E. B. Serrona, A. Sugimura, N. Adachi, T. Okuda, H. Ohsato, I. Sakamoto, A. Nakanishi, M. Motokawa, D. H. Ping, and K. Hono

Appl. Phys. Lett. 82, 1751 (2003); http://dx.doi.org/10.1063/1.1561576 (3 pages) | Cited 25 times

Online Publication Date: 10 March 2003

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Relatively good hard magnetic properties obtained from Nd2Fe14B films prepared by the rf sputtering technique were investigated in terms of the microstructural development. Although as-deposited films on Mo substrates deposited at substrate temperatures (Ts) of 365 °C were amorphous with the dispersion of nanocrystalline NdO particles, columnar grains of Nd2Fe14B phase with the c-axis perpendicular to the film plane developed after annealing at 650 °C at an optimized heating rate. Nd2Fe14B grain size was about 400 nm in average and NdO particles of about 10 nm were dispersed within the grains and along the grain boundaries. These films exhibited good perpendicular hard magnetic properties of iHc = 1356 kA/m and (BH)MAX ∼ 216 kJ/m3. © 2003 American Institute of Physics.
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75.50.Ww Permanent magnets
75.70.Ak Magnetic properties of monolayers and thin films
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
75.30.Gw Magnetic anisotropy
81.15.Cd Deposition by sputtering
75.50.Bb Fe and its alloys
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
81.40.Rs Electrical and magnetic properties related to treatment conditions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
61.72.Mm Grain and twin boundaries

Microstructure and high critical current of powder-in-tube MgB2

A. Serquis, L. Civale, D. L. Hammon, J. Y. Coulter, X. Z. Liao, Y. T. Zhu, D. E. Peterson, and F. M. Mueller

Appl. Phys. Lett. 82, 1754 (2003); http://dx.doi.org/10.1063/1.1561572 (3 pages) | Cited 31 times

Online Publication Date: 10 March 2003

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We report dc transport and magnetization measurements of the critical current density, Jc, and microstructural analyses of MgB2 wires fabricated by the powder-in-tube method (PIT) using commercial MgB2 powder with 5 at. % Mg powder added as an additional source of magnesium and stainless steel as a sheath material. We identify a weak-link behavior in the as-drawn wire associated with the presence of microcracks. By appropriate heat treatments, we can increase Jc by more than one order of magnitude due to a recrystallization process promoted by the excess Mg, which results in the elimination of most of our microcracks. In contrast, inappropriate annealing conditions result in a deterioration of connectivity due to an inhomogeneous loss of Mg. Grain size and porosity play only a secondary role in determining Jc in PIT MgB2. © 2003 American Institute of Physics.
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74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
74.25.Sv Critical currents
74.25.Ha Magnetic properties including vortex structures and related phenomena
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
81.40.Rs Electrical and magnetic properties related to treatment conditions
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