Journal ArticleDOI
Enhanced magneto-optical Kerr effect in spontaneously ordered FePt alloys: Quantitative agreement between theory and experiment.
Alfonso Cebollada,Dieter Weller,J. Sticht,G. R. Harp,R. F. C. Farrow,Ronald Franklin Marks,R. Savoy,J. C. Scott +7 more
TLDR
In this paper, a chemical-ordering-induced peak in the polar magneto-optical Kerr effect spectra of FePt compounds is found to be in quantitative agreement with predictions based on ab initio magnetooptical calculations.Abstract:
A chemical-ordering-induced peak in the polar magneto-optical Kerr effect spectra of FePt compounds is found to be in quantitative agreement with predictions based on ab initio magneto-optical calculations. Experimental spectra of epitaxial molecular-beam-epitaxy grown FePt(001) films reveal a more than twofold enhancement of the Kerr rotation if full chemical ordering is present. A spectral feature at 2-eV photon energy shows a peak Kerr rotation of up to \ensuremath{\sim}0.8\ifmmode^\circ\else\textdegree\fi{}, which is strongly correlated with the presence of perpendicular magnetic anisotropy in ordered compound films.read more
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Journal ArticleDOI
High K/sub u/ materials approach to 100 Gbits/in/sup 2/
Dieter Weller,Andreas Moser,Liesl Folks,Margaret Evans Best,Wen Lee,Michael F. Toney,M. M. Schwickert,Jan-Ulrich Thiele,M. Doerner +8 more
TL;DR: In this article, the authors present a review of the literature on high Ku alternative media, both for longitudinal and perpendicular recording, with data on sputtered and evaporated thin FePt films, with coercivities exceeding 10000 Oe.
Journal ArticleDOI
Thermal effect limits in ultrahigh-density magnetic recording
Dieter Weller,Andreas Moser +1 more
TL;DR: In this article, the authors discuss thermal effects in the framework of basic Arrhenius-Neel statistical switching models and reveal the onset of thermal decay at "stability ratios" (k/sub u/V/K/sub B/T)/sub 0//spl sime/35 /spl plusmn/ 2.
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Exploring the microscopic origin of magnetic anisotropies with X-ray magnetic circular dichroism (XMCD) spectroscopy
TL;DR: In this article, a simple ligand field model was developed to visualize the origin of magnetocrystalline anisotropy in terms of the preferred direction of the orbital moment, corresponding to the direction of maximum size.
Journal ArticleDOI
FeRh/FePt exchange spring films for thermally assisted magnetic recording media
TL;DR: The temperature-dependent magnetic response of exchange-coupled FePt/FeRh thin films is described in this article, where the FeRh layer is antiferromagnetic at room temperature but becomes ferromagnetic with a large magnetic moment and low magnetocrystalline anisotropy, forming an exchange-spring system and significantly lowering the coercive field of the composite system.
Journal ArticleDOI
Future perspectives for spintronic devices
TL;DR: Spintronics is one of the emerging research fields in nanotechnology and has been growing very rapidly as mentioned in this paper, which has led to the discovery of giant magnetoresistance in 1988, which utilized spin-polarized electron transport across a non-magnetic metallic layer.