Optical Waveguide Device for a Magneto-Optical Disk Head

Minami, K.; Yamamoto, Hiroyuki; Yoshimoto, Akihito; Yoshida, Yoshio; Kurata, Y.

doi:10.3379/jmsjmag.22.s2_163

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…From the theoretical point of view, most of the work has been devoted to the study of equilibrium properties of thin magnetic films [9,10,11,12,13,14] and magnetic materials, see e.g. [15,16,17,18]. In contrast, the aim of this work is to study the properties of thin magnetic film growth under far-fromequilibrium conditions, by means of extensive Monte Carlo simulations.…”

Section: Introductionmentioning

confidence: 99%

Order-disorder criticality, wetting, and morphological phase transitions in the irreversible growth of far-from-equilibrium magnetic films

Candia

Albano

2003

Journal of Magnetism and Magnetic Materials

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An exhaustive numerical investigation of the growth of magnetic films in confined (d + 1)-dimensional stripped geometries (d = 1, 2) is carried out by means of extensive Monte Carlo simulations. Films in contact with a thermal bath at temperature T , are grown by adding spins having two possible orientations and considering ferromagnetic (nearest-neighbor) interactions. At low temperatures, thin films of thickness L are constituted by a sequence of wellordered domains of average length l D ≫ L. These domains have opposite magnetization. So, the films exhibit "spontaneous magnetization reversal" during the growth process. Such reversal occurs within a short characteristic length l R , such that l D ≫ l R ∼ L. Furthermore, it is found that for d = 1 the system is non-critical, while a continuous order-disorder phase transition at finite temperature takes place in the d = 2 case. Using standard finite-size scaling procedures, the critical temperature and some relevant critical exponents are determined. Finally, the growth of magnetic films in (2 + 1) dimensions with competing short-range magnetic fields acting along the confinement walls is studied. Due to the antisymmetric condition considered, an interface between domains with spins having opposite orientation develops along the growing direction. Such an interface undergoes a localization-delocalization transition that is the precursor of a wetting transition in the thermodynamic limit. Furthermore, the growing interface also undergoes morphological transitions in the growth mode. A comparison between the well-studied equilibrium Ising model and the studied irreversible magnetic growth model is performed throughout. Although valuable analogies are encountered, it is found that the nonequilibrium nature of the latter introduces new and rich physical features of interest.

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Section: Introductionmentioning

confidence: 99%

Order-disorder criticality, wetting, and morphological phase transitions in the irreversible growth of far-from-equilibrium magnetic films

Candia

Albano

2003

Journal of Magnetism and Magnetic Materials

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Optical Pickup Employing a Hologram-Laser-Photodiode Unit

Yoshida¹,

Minami

Okada³

et al. 2000

Jpn. J. Appl. Phys.

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In this paper we review the holographic optical element technology applied to compact disc (CD), digital versatile disc (DVD) and mini disc (MD) pickups. Using this technology, the number of optical components and the size and weight of a CD pickup are successfully reduced and its reliability is improved, because many functions of the optical components are integrated into a hologram-laser-photodiode unit. For DVD application, the focus detection for a dual-layer disk and the differential phase detection (DPD) method are realized by the hologram technology. Our unique two-segment DPD method shows more stable characteristics than the conventional DPD method. An integrated MD hologram pickup is also developed with an optical waveguide device that functions in magneto optical (MO) signal detection.

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Optical Waveguide Device for a Magneto-Optical Disk Head

Cited by 2 publications

References 2 publications

Order-disorder criticality, wetting, and morphological phase transitions in the irreversible growth of far-from-equilibrium magnetic films

Order-disorder criticality, wetting, and morphological phase transitions in the irreversible growth of far-from-equilibrium magnetic films

Optical Pickup Employing a Hologram-Laser-Photodiode Unit

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