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6 Aug 2001

Volume 79, Issue 6, pp. 705-888

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Domain wall pinning on strain relaxation defects in FePt(001)/Pt thin films

J. P. Attané, Y. Samson, A. Marty, D. Halley, and C. Beigné

Appl. Phys. Lett. 79, 794 (2001); http://dx.doi.org/10.1063/1.1390321 (3 pages) | Cited 22 times

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Thin FePt (001) films, grown by molecular-beam epitaxy on Pt(001), exhibit a very large perpendicular magnetic anisotropy (Ku = 5×106 J m−3) and a 100% magnetic remanence in perpendicular field. The lattice misfit between FePt and Pt (1.5%) relaxes through the pileup of a/6 〈112〉 partial dislocations along {111} planes, leading to the formation of microtwins. Atomic force microscopy images demonstrate that this process induces a spontaneous rectangular nanostructuration of the sample, while magnetic force microscopy shows that the microtwins act as pinning sites for the magnetic walls. This leads to square magnetic domains and explains the large coercivity associated with the domain wall propagation. © 2001 American Institute of Physics.
Show PACS
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.50.Bb Fe and its alloys
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
61.72.Ff Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
61.72.Mm Grain and twin boundaries
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
68.37.Ps Atomic force microscopy (AFM)
68.37.Rt Magnetic force microscopy (MFM)
75.60.Ch Domain walls and domain structure

Partitioning behavior and the effect of Co on the Curie temperature of nanocomposite PrFeCoB hard magnetic alloys

Y. Zhang, P. J. Warren, A. Cerezo, C. L. Harland, and H. A. Davies

Appl. Phys. Lett. 79, 797 (2001); http://dx.doi.org/10.1063/1.1388879 (3 pages) | Cited 3 times

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The microstructure and phase chemistry of melt-spun nanocomposite Pr9.7Fe76.6Co7.8B5.9 and Pr9.2Fe69.4Co15.4B6.0 ribbons have been studied using three-dimensional atom probe (3DAP) and transmission electron microscopy. The microstructure of these alloys consists of two phases, bcc α-Fe–Co and tetragonal Pr2(FeCo)14B. Practically all of the B and Pr atoms are rejected from the α-Fe–Co phase and are concentrated into the 2/14/1 hard magnetic phase. However, no significant difference of Co concentration between the two phases is observed. From the measured Co concentration in the 2/14/1 phase, it is explained why the effect of Co content on Curie temperature (Tc) is greater in the nanocomposite alloys than in single phase alloys. Predictions of Tc for the nanocomposite alloys based on the 3DAP composition data show excellent agreement with experimental measurements. © 2001 American Institute of Physics.
Show PACS
75.50.Ww Permanent magnets
75.50.Bb Fe and its alloys
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
81.05.Bx Metals, semimetals, and alloys
75.50.Tt Fine-particle systems; nanocrystalline materials
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