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17 Jul 2000

Volume 77, Issue 3, pp. 313-459

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Crosstalk canceling for laser-assisted magnetic recording

M. Hamamoto, K. Kojima, J. Sato, H. Katayama, and Y. Murakami

Appl. Phys. Lett. 77, 415 (2000); http://dx.doi.org/10.1063/1.126994 (3 pages) | Cited 5 times

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A promising method of crosstalk canceling is proposed for laser-assisted magnetic recording, which makes it possible to record and read with a narrow track pitch limited to nearly the size of a focused laser spot. In this method, a track pitch narrower than the laser spot size is obtained by utilizing the canceling of the leakage flux from an adjacent track. We achieved a crosstalk of −24 dB or less with a 0.7 μm track pitch in laser-assisted magnetic recording by using a laser spot size of 1.07 μm in diameter and a magnetoresistive head with a track width of 1.4 μm. © 2000 American Institute of Physics.
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.

Magnetocaloric effect in Gd2PdSi3

E. V. Sampathkumaran, I. Das, R. Rawat, and Subham Majumdar

Appl. Phys. Lett. 77, 418 (2000); http://dx.doi.org/10.1063/1.126995 (3 pages) | Cited 25 times

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The influence of the application of a magnetic field (H) on the temperature (T) dependence of heat capacity and isothermal magnetization has been investigated in Gd2PdSi3, a compound ordering antiferromagnetically below (TN = )21 K in zero H. Among other findings, the one to be emphasized is the observation of significant magnetocaloric effect (MCE) over about a 30 K range with a peak in the vicinity of TN. This finding suggests that this material could be useful for magnetic refrigeration below 50 K. The results also establish that either of the two experimental methods—heat capacity or magnetization—can be applied to identify materials with large MCE. © 2000 American Institute of Physics.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Ee Antiferromagnetics

Sm(Co, Fe, Cu, Zr)z magnets fabricated by simple processing

W. Tang, Y. Zhang, and G. C. Hadjipanayis

Appl. Phys. Lett. 77, 421 (2000); http://dx.doi.org/10.1063/1.126996 (2 pages) | Cited 13 times

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Optimization studies in Sm(Co, Cu, Fe, Zr)z magnets for high-temperature applications led to some compositions which develop their high coercivity with simple processing. Homogenized magnets with higher Cu and Zr content acquire a coercivity of above 20 kOe after a short aging (3 h) at 850 °C without the traditional slow cooling to 400 °C which is required for the commercial magnets. Microstructure studies showed that the homogenized magnets consist of a mixture of Sm(Co, Cu)5 precipitates in a disordered 2:17 matrix as compared to a uniform and featureless microstructure of the traditional homogenized magnets. Because of this, the time required for the full development of uniform cellular and lamellar structures with the right microchemistry is much shorter in the magnets. © 2000 American Institute of Physics.
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75.50.Ww Permanent magnets
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.05.Bx Metals, semimetals, and alloys
81.40.Rs Electrical and magnetic properties related to treatment conditions
81.40.Cd Solid solution hardening, precipitation hardening, and dispersion hardening; aging
81.30.Mh Solid-phase precipitation
75.50.Bb Fe and its alloys

Magnetization reversal of ferromagnetic/antiferromagnetic bilayers

Zhanjie Li and Shufeng Zhang

Appl. Phys. Lett. 77, 423 (2000); http://dx.doi.org/10.1063/1.126997 (3 pages) | Cited 28 times

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By incorporating random interfacial exchange interaction into the Landau–Lifshitz–Gilbert equation, we show that magnetization reversal of exchange-biased films possesses unique hysteresis features. A detail magnetization reversal process for different ferromagnetic layer thickness is analyzed. © 2000 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Et Exchange and superexchange interactions
75.70.Kw Domain structure (including magnetic bubbles and vortices)

Thermally stable, soft FeXN thin films

Yi-Kuang Liu and M. H. Kryder

Appl. Phys. Lett. 77, 426 (2000); http://dx.doi.org/10.1063/1.126998 (3 pages) | Cited 13 times

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Significant improvement of the thermal stability in FeXN (X=Al, Zr, Ta,…) thin films is reported. Sputtered at the reduced target–substrate spacing of 38 mm, 200-nm-thick thermally stable FeXN thin films are obtained. They have hard-axis coercivity ≈ 0.1–2.0 Oe, easy-axis coercivity ≈1.5–3.0 Oe, Hk ≈ 8–16 Oe, and Bs ≈ 19–20 kG. Results of transverse-field annealing experiments in a uniform field of 700 Oe show no significant change of magnetic properties at 150 °C for 3 h. At 150 °C for 24 h Hk decreases by 2–4 Oe. Their easy/hard axes do not rotate and the coercivity remains almost unchanged. This superior thermal stability of FeXN films is very promising for high-moment write heads. © 2000 American Institute of Physics.
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75.50.Ss Magnetic recording materials
75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.40.Rs Electrical and magnetic properties related to treatment conditions
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
81.15.Cd Deposition by sputtering

Submillimeter spectroscopy of tilted Nd1.85Ce0.15CuO4−δ films: Observation of a mixed ac-plane excitation

A. Pimenov, A. V. Pronin, A. Loidl, A. P. Kampf, S. I. Krasnosvobodtsev, and V. S. Nozdrin

Appl. Phys. Lett. 77, 429 (2000); http://dx.doi.org/10.1063/1.126999 (3 pages) | Cited 3 times

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The anisotropic conductivity of a series of tilted Nd1.85Ce0.15CuO4−δ thin films was measured by quasioptical spectroscopy in the frequency range 6 cm−1<ν<40 cm−1. Two characteristic features have been observed in the low-temperature transmission spectra. The first one at ν = 12 cm−1 was shown to reflect the c-axis plasma frequency of Nd1.85Ce0.15CuO4−δ. The second feature represents a mixed ab-plane/c-axis excitation. The frequency of this resonance may be changed in a controllable way by rotating the polarization of the incident radiation. © 2000 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
78.70.Gq Microwave and radio-frequency interactions
74.25.F- Transport properties

Superconducting quantum wells for the detection of submillimeter wave electromagnetic radiation

Faiz Rahman and Trevor Thornton

Appl. Phys. Lett. 77, 432 (2000); http://dx.doi.org/10.1063/1.127000 (3 pages) | Cited 2 times

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We propose the use of superconducting quantum well structures for use as detectors of submillimeter wave radiation. The energy levels formed due to quantum confinement by superconducting barriers provide a useful system for radiation sensing. The well width could be readily altered by varying the temperature or the strength of an applied magnetic field so that the levels can be shifted in energy. This provides a means of tuning the detector over a range of frequencies in the terahertz range, enabling both photometric and spectroscopic observations. Also, the structure of the device should permit use of cofabricated antennas allowing efficient radiation coupling into the active region of the device. The geometry also allows the possibility of implementing one- and two-dimensional arrays. © 2000 American Institute of Physics.
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85.25.Pb Superconducting infrared, submillimeter and millimeter wave detectors
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
84.40.Ba Antennas: theory, components and accessories
07.60.Dq Photometers, radiometers, and colorimeters
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