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15 May 2003

Volume 93, Issue 10, pp. 5855-8792

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Study of domain wall magnetoresistance by submicron patterned magnetic structure

C. Yu, S. F. Lee, J. L. Tsai, E. W. Huang, T. Y. Chen, Y. D. Yao, Y. Liou, and C. R. Chang

J. Appl. Phys. 93, 8761 (2003); http://dx.doi.org/10.1063/1.1558605 (3 pages) | Cited 10 times

Online Publication Date: 9 May 2003

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Through the proper design of submicron permalloy (Ni80Fe20) wires, domain wall magnetoresistance is investigated. A positive contribution to magnetoresistance (MR) was found for domain walls in these wires after extracting the anisotropic MR effect. Some theoretical models are used to discuss our results. © 2003 American Institute of Physics.
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75.47.Np Metals and alloys
75.60.Ch Domain walls and domain structure
75.50.Bb Fe and its alloys
75.70.Kw Domain structure (including magnetic bubbles and vortices)
72.15.Gd Galvanomagnetic and other magnetotransport effects

First principles determinations of magnetic anisotropy energy of Co nanoclusters

Jisang Hong and R. Q. Wu

J. Appl. Phys. 93, 8764 (2003); http://dx.doi.org/10.1063/1.1537707 (2 pages) | Cited 1 time

Online Publication Date: 9 May 2003

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We have calculated magnetic anisotropy energies of several free standing Co nanoclusters consisting of one, two, three, and six Co atoms with the full potential linearized augmented plane wave method. The magnetic moments are found to be aligned perpendicular to the Co–Co bond. The results show that the spin magnetic moments are suppressed by roughly 10% compared to Co monolayer or Co nanowire. Orbital magnetic moments and anisotropy energies depend sensitively on the size and shape of clusters. © 2003 American Institute of Physics.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Cc Other ferromagnetic metals and alloys
75.30.Gw Magnetic anisotropy
71.15.-m Methods of electronic structure calculations
75.30.Cr Saturation moments and magnetic susceptibilities
71.15.Ap Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)

Ferromagnetic quantum dots formed by external laser irradiation

J. Y. Yang, K. S. Yoon, Y. H. Do, C. O. Kim, J. P. Hong, Y. H. Rho, and H. J. Kim

J. Appl. Phys. 93, 8766 (2003); http://dx.doi.org/10.1063/1.1558600 (3 pages) | Cited 7 times

Online Publication Date: 9 May 2003

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We present an efficient method for the formation of cobalt ferromagnetic quantum dots (FMQDs) by exposing a Nd: YAG laser (wavelength=355 nm) on ferromagnetic thin films grown on Si substrates. Primary emphasis is placed on the simple and direct fabrication of the FMQDs without performing any micro- or nanopattering process. Scanned laser irradiation of low power causes localized segregation of ultrathin as-deposited films by the laser-induced heat, resulting in the fabrication of FMQDs. Observations by scanning electron microscope and atomic force microscope clearly confirm highly uniform controllable nanoscale FMQDs in our case. The average size and density of the FMQDs were about 10 nm and 2×1011/cm2, respectively. Magnetic characteristics of the FMQDs were also measured by a superconducting quantum interference device at 5 K. © 2003 American Institute of Physics.
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75.75.-c Magnetic properties of nanostructures
81.07.Ta Quantum dots
75.70.Ak Magnetic properties of monolayers and thin films
79.20.Ds Laser-beam impact phenomena
68.35.Dv Composition, segregation; defects and impurities
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