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5 Feb 2001

Volume 78, Issue 6, pp. 685-846

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Validity of the Stoner–Wohlfarth model in hysteretic giant magnetoimpedance of annealed amorphous materials

Cheol Gi Kim, Seok Soo Yoon, Kil Jae Jang, and Chong-Oh Kim

Appl. Phys. Lett. 78, 778 (2001); http://dx.doi.org/10.1063/1.1345799 (3 pages) | Cited 10 times

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The hysteretic characteristics of giant magnetoimpedance (GMI) profiles have been measured in Co-based amorphous ribbon with various anisotropy angles θk, and they have been analyzed by using the Stoner–Wohlfarth model. A two-peak behavior with a dip near zero field is revealed in the measured GMI profile at 10 MHz, irrespective of θk. The negligible hysteresis of the field for the dip is in close agreement with that calculated assuming a magnetization jump from a metastable to a stable state. However, the hysteretic asymmetries for the increasing and decreasing fields in the samples with the angle range of 20° ⩽ θk<60° are well described by a divergence in the calculation without a magnetization jump. The asymmetry for the sample with θk ≥ 60° may also be due to the divergence. But the two peak of the measured profiles, which are due to the anisotropy distribution in the actual materials, are different from the calculated profiles, which have a single peak near zero field. This indicates that the Stoner–Wohlfarth model adequately describes a hysteretic asymmetry of GMI profiles for the anisotropy angle in the range of 20° ⩽ θk<60° at a frequency of 10 MHz in amorphous ribbons. © 2001 American Institute of Physics.
Show PACS
75.50.Kj Amorphous and quasicrystalline magnetic materials
72.15.Gd Galvanomagnetic and other magnetotransport effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy

Cationic ordering control of magnetization in Sr2FeMoO6 double perovskite

Ll. Balcells, J. Navarro, M. Bibes, A. Roig, B. Martínez, and J. Fontcuberta

Appl. Phys. Lett. 78, 781 (2001); http://dx.doi.org/10.1063/1.1346624 (3 pages) | Cited 167 times

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The role of the synthesis conditions on the cationic Fe/Mo ordering in Sr2FeMoO6 double perovskite is addressed. It is shown that this ordering can be controlled and varied systematically. The Fe/Mo ordering has a profound impact on the saturation magnetization of the material. Using the appropriate synthesis protocol a value of 3.7 μB has been obtained. Mössbauer analysis reveals the existence of two distinguishable Fe sites and a charge density at the Fem+ ions significantly larger than 3d5 suggesting a Fe contribution to the spin-down conduction band. The implications of these findings for the synthesis of Sr2FeMoO6 having optimal magnetoresistance response are discussed. © 2001 American Institute of Physics.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
72.20.My Galvanomagnetic and other magnetotransport effects
76.80.+y Mössbauer effect; other γ-ray spectroscopy
71.20.Ps Other inorganic compounds

Magnetic block array for patterned magnetic media

Kazuyuki Koike, Hideo Matsuyama, Yoshiyuki Hirayama, Kiwamu Tanahashi, Takashi Kanemura, Osamu Kitakami, and Yutaka Shimada

Appl. Phys. Lett. 78, 784 (2001); http://dx.doi.org/10.1063/1.1345804 (3 pages) | Cited 24 times

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We have fabricated a magnetic rectangular block array of 130 Gblock/in.2 with a block-size-to-period ratio of 0.85 by using focused ion beam lithography. Each block has perpendicular crystal magnetic anisotropy and a single domain structure. Its advantage as patterned media is discussed in conjunction with thermal stability in recorded magnetization, reading signal, and area density. © 2001 American Institute of Physics.
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75.50.Ss Magnetic recording materials
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Ak Magnetic properties of monolayers and thin films

Efficient modified “walk on spheres” algorithm for the linearized Poisson–Bolzmann equation

Chi-Ok Hwang and Michael Mascagni

Appl. Phys. Lett. 78, 787 (2001); http://dx.doi.org/10.1063/1.1345817 (3 pages) | Cited 3 times

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A discrete random walk method on grids was proposed and used to solve the linearized Poisson–Boltzmann equation (LPBE) [R. Ettelaie, J. Chem. Phys. 103, 3657 (1995)]. Here, we present an efficient grid-free random walk method. Based on a modified “walk on spheres” algorithm [B. S. Elepov and G. A. Mihailov, Sov. Math. Dokl. 14, 1276 (1973)] for the LPBE, this Monte Carlo algorithm uses a survival probability distribution function for the random walker in a continuous and free diffusion region. This simulation method is illustrated by computing four analytically solvable problems. In all cases, excellent agreement is observed. © 2001 American Institute of Physics.
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05.60.Cd Classical transport
02.60.Lj Ordinary and partial differential equations; boundary value problems
02.50.Ng Distribution theory and Monte Carlo studies

All Ya–Ba–Cu–O c-axis trilayer interface-engineered Josephson junctions

B. H. Moeckly

Appl. Phys. Lett. 78, 790 (2001); http://dx.doi.org/10.1063/1.1345821 (3 pages) | Cited 9 times

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See Also: Erratum

Show Abstract
We demonstrate the fabrication of c-axis YBCO trilayer Josephson junctions incorporating an engineered interface as the barrier layer. These devices display resistively shunted junction-like I–V characteristics with IcRn products >1 mV at 4.2 K and ∼100 μV at 60 K. © 2001 American Institute of Physics.
Show PACS
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
85.25.Cp Josephson devices
74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
81.65.Cf Surface cleaning, etching, patterning
68.35.Ct Interface structure and roughness
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