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5 Jan 1998

Volume 72, Issue 1, pp. 1-133

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A microstructural study of annealed Ti/Co/Cu/Co/MnFe/Ti spin-valve films

X. Portier, A. K. Petford-Long, P. Bayle-Guillemaud, T. C. Anthony, and J. A. Brug

Appl. Phys. Lett. 72, 118 (1998); http://dx.doi.org/10.1063/1.120662 (3 pages) | Cited 6 times

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Spin-valve properties are adversely affected by heat treatments and in order to study this effect, microstructural analyses of Ti/Co/Cu/Co/MnFe/Ti spin-valve films annealed at 225 and at 290 °C have been performed. Whereas the lower temperature tends to optimize the giant magnetoresistance (GMR) ratio, the higher temperature induces a significant decrease in the GMR ratio (from 7.5% to 5.2%). High resolution electron microscopy studies have explained this result as being due to the formation of a TiCo alloy at the Ti/Co interface and to a decrease in the thickness of the sense layer. No significant modification of either the Co/Cu or the Cu/Co interfaces has been observed. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
73.61.At Metal and metallic alloys
75.47.De Giant magnetoresistance
81.40.Rs Electrical and magnetic properties related to treatment conditions
81.40.Gh Other heat and thermomechanical treatments
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
68.55.-a Thin film structure and morphology
68.35.Ct Interface structure and roughness

High performance α-Fe/Nd2Fe14B-type nanocomposites

W. C. Chang, D. Y. Chiou, S. H. Wu, B. M. Ma, and C. O. Bounds

Appl. Phys. Lett. 72, 121 (1998); http://dx.doi.org/10.1063/1.121446 (3 pages) | Cited 46 times

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The α-Fe/R2Fe14B-type exchange-coupled NdFeB nanocomposites with a coercivity (iHc) of more than 11 kOe and energy product, (BH)max, of more than 16 MGOe have been successfully obtained on melt spun (Nd0.95La0.05)7.5+xFebalCr2B10 alloy powders, where x ranged from 3 to 3.5. It was found that a slight substitution of Cr for Fe suppresses the formation of the R2Fe23B3 and Fe3B phases during crystallization and results in the formation of an α-Fe/R2Fe14B mixture. Increasing the total rare earth content was found to enhance the remanence, and the iHc of (Nd0.95La0.05)7.5+xFe80.5−xCr2B10 ribbons was also increased drastically with increasing values of x. A Br of 9.2–9.7 kG, iHc of 11.1–13.2 kOe, and (BH)max of 16.5–18.0 MGOe have been obtained on (Nd0.95La0.05)7.5+xFe80.5−xCr2B10 (x = 3–3.5). © 1998 American Institute of Physics.
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75.50.Vv High coercivity materials
75.50.Ww Permanent magnets
75.50.Bb Fe and its alloys
75.50.Kj Amorphous and quasicrystalline magnetic materials
81.07.-b Nanoscale materials and structures: fabrication and characterization
75.30.Et Exchange and superexchange interactions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

The spin-polarized scanning electron microscope observation of 0.1 μm marks recorded by magnetic field modulation on a magneto-optical recording disk

Teruo Kohashi, Hideo Matsuyama, Kazuyuki Koike, Yoshiteru Murakami, Yasuhito Tanaka, and Hiroyuki Awano

Appl. Phys. Lett. 72, 124 (1998); http://dx.doi.org/10.1063/1.120666 (3 pages) | Cited 2 times

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The magneto-optically recorded marks with magnetic field modulation method were studied using spin-polarized scanning electron microscopy. We confirmed that marks with as short a length as 0.1 μm could be written repeatedly even with laser spot sizes about 1.2 μm. This mark length is less than ⅙ that of present commercial products. © 1998 American Institute of Physics.
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85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)
42.79.Vb Optical storage systems, optical disks
85.70.Sq Magnetooptical devices
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
68.37.Hk Scanning electron microscopy (SEM) (including EBIC)
68.37.Lp Transmission electron microscopy (TEM)
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