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31 May 2004

Volume 84, Issue 22, pp. 4361-4576

Issue Cover Spotlight Figure

Appl. Phys. Lett. 84, 4409 (2004); http://dx.doi.org/10.1063/1.1757648 (3 pages)

Azita Soleymani, Piroz Zamankhan, and William Polashenski
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Controlling the crystallization and magnetic properties of melt-spun Pr2Fe14B/α-Fe nanocomposites by Joule heating

Z. Q. Jin, B. Z. Cui, J. P. Liu, Y. Ding, Z. L. Wang, and N. N. Thadhani

Appl. Phys. Lett. 84, 4382 (2004); http://dx.doi.org/10.1063/1.1757017 (3 pages) | Cited 11 times

Online Publication Date: 12 May 2004

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Pr2Fe14B/α-Fe based nanocomposites have been prepared through crystallization of melt-spun amorphous Pr7Tb1Fe85Nb0.5Zr0.5B6 ribbons by means of ac Joule heating while simultaneously monitoring room-temperature electrical resistance R. The R value shows a strong variation with respect to applied current I, and is closely related to the amorphous-to-nanocrystalline phase transformation. The curve of R versus I allows one to control the crystallization behavior during Joule heating and to identify the heat-treatment conditions for optimum magnetic properties. A coercivity of 550 kA/m and a maximum energy product of 128 kJ/m3 have been obtained upon heating the amorphous ribbons at a current of 2.0 A. These properties are around 30% higher than the values of samples prepared by conventionally (furnace) annealed amorphous ribbons. © 2004 American Institute of Physics.
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81.07.Bc Nanocrystalline materials
64.70.K- Solid-solid transitions
81.40.Gh Other heat and thermomechanical treatments
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
72.20.Fr Low-field transport and mobility; piezoresistance
72.80.Tm Composite materials

Introduction and control of metastable states in elliptical and rectangular magnetic nanoelements

Xiaoxi Liu, John N. Chapman, Stephen McVitie, and Chris D. W. Wilkinson

Appl. Phys. Lett. 84, 4406 (2004); http://dx.doi.org/10.1063/1.1757647 (3 pages) | Cited 18 times

Online Publication Date: 12 May 2004

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Small elongated magnetic elements normally support near uniform magnetization distributions and switch abruptly under the influence of fields applied close to their long axes. However metastable states can be introduced in rectangular and elliptical nanoelements by applying fields parallel to their short axes. Using Lorentz microscopy and in situ magnetizing experiments we have established the conditions under which vortex states can be introduced. Their occurrence depends on the formation of a “C” rather than an “S” state as the applied field is reduced following saturation. Micromagnetic modeling provides support for the conclusions drawn from the experimental observations. © 2004 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ch Domain walls and domain structure
75.30.Cr Saturation moments and magnetic susceptibilities
75.70.Kw Domain structure (including magnetic bubbles and vortices)

Room-temperature ferromagnetism in ion-implanted Co-doped TiO2(110) rutile

V. Shutthanandan, S. Thevuthasan, S. M. Heald, T. Droubay, M. H. Engelhard, T. C. Kaspar, D. E. McCready, L. Saraf, S. A. Chambers, B. S. Mun, N. Hamdan, P. Nachimuthu, B. Taylor, R. P. Sears, and B. Sinkovic

Appl. Phys. Lett. 84, 4466 (2004); http://dx.doi.org/10.1063/1.1753652 (3 pages) | Cited 31 times

Online Publication Date: 14 May 2004

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Ferromagnetic Co-doped rutile TiO2 single crystals were synthesized by high-temperature ion implantation and characterized by a variety of techniques. Co is uniformly distributed to a depth of ∼300 nm with an average concentration of ∼2 at. %, except in the near-surface region, where the concentration is ∼3 at. %. Ferromagnetic behavior is exhibited at room temperature with an effective saturation magnetization of ∼ 0.6 μB/Co atom. The Co is in a formal oxidation state of +2 throughout the implanted region, and no Co(O) is detected. © 2004 American Institute of Physics.
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75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
61.72.up Other materials
78.70.Dm X-ray absorption spectra
79.60.Bm Clean metal, semiconductor, and insulator surfaces
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
82.80.Yc Rutherford backscattering (RBS), and other methods of chemical analysis
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.65.Mq Oxidation

Scanning ferromagnetic resonance microscopy and resonant heating of magnetite nanoparticles: Demonstration of thermally detected magnetic resonance

F. Sakran, A. Copty, M. Golosovsky, D. Davidov, and P. Monod

Appl. Phys. Lett. 84, 4499 (2004); http://dx.doi.org/10.1063/1.1756682 (3 pages) | Cited 7 times

Online Publication Date: 14 May 2004

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We report a 9 GHz microwave scanning probe based on a slit aperture for spatially resolved magnetic resonance detection. We use patterned layers of dispersed magnetite Fe3O4 nanoparticles and demonstrate low-field ferromagnetic resonance images with a spatial resolution of 15 μm. We also demonstrate localized heating of magnetite nanoparticles via ferromagnetic resonance absorption which can be controlled by an external dc magnetic field. Using our microwave probe as a transmitter and a temperature sensor (thermocouple or infrared detector), we show thermally detected magnetic resonance at room temperature. © 2004 American Institute of Physics.
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75.50.Gg Ferrimagnetics
75.50.Tt Fine-particle systems; nanocrystalline materials
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
07.79.-v Scanning probe microscopes and components
75.50.Dd Nonmetallic ferromagnetic materials

Magnetic-field-induced structural homogeneity of a phase-separated manganite

M. S. Gagliardi, Y. Ren, J. F. Mitchell, and M. A. Beno

Appl. Phys. Lett. 84, 4538 (2004); http://dx.doi.org/10.1063/1.1758777 (3 pages) | Cited 3 times

Online Publication Date: 14 May 2004

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Magnetic field (MF) dependence of the phase separation (PS) in the manganite Pr0.65(Ca0.7Sr0.3)0.35MnO3 was studied using high-energy x-ray powder diffraction. The compound shows intrinsic inhomogeneities in the form of coexisting competing phases below a temperature Tc. Application of MFs not only eliminates the multiple phases below Tc but also significantly affects the structure above Tc. The MF-induced structural phase transition occurs abruptly at 2 K but is smooth at higher temperatures. Moreover, the MF dependence of some reflection intensities clearly indicates a complicated PS. This MF-induced homogeneity should play a key role in the colossal magnetoresistance effect. © 2004 American Institute of Physics.
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75.47.Lx Magnetic oxides
61.05.cp X-ray diffraction
64.70.K- Solid-solid transitions
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