MAGNETO-OPTICAL CHARACTERIZATION OF FeAu ARTIFICIALLY ORDERED ALLOY

Abstract

Superlattices consisting of Fe and Au ultrathin layers with thickness of a few monolayers were prepared. Fonnation of Llo-type structure in the Fe(lML)!Au(lML) superlattice was confinned by X-ray diffraction. Magneto-optical studies suggest fonnation of a new energy band structure characteristic of the new alloy.

Theory of the Anisotropic Magneto-Optical Kerr Effect in Artificial FeAu and MnAu and in XAu₄ (X=V, Cr, Mn) Compounds

“…The calculated MOKE spectra of the artificial FeAu and MnAu compounds are shown in Fig. 1, together with the experimental spectra of FeAu [38]. The calculated Kerr rotations of FeAu and MnAu are rather similar, displaying a peak at 2 e V, followed by two zero crossings and a second larger peak at about 6eV.…”

“…Artificially ordered materials, such as FeAu and Fel Au superIattices, have recently drawn considerable attention [35][36][37][38][39]. Ordered FeAu compounds do not exist in nature, however, it has been possible to fabricate the ordered FeAu compound with L10 (Le., AuCu) structure, as well as various ordered Fel Au superIattices, through URV deposition techniques [36,37].…”

Fe thin-film growth on Au(100): A self-surfactant effect and its limitations

“…This should allow one to study the transition from the two-dimensional ͑2D͒ limit of a single ͑100͒ monolayer ͑ML͒ to quasi-3D bcc-Fe films and the growth of ͓Au/Fe͔ n /Au(100) multilayers exhibiting, e.g., oscillatory magnetoresistance [7][8][9] and novel magneto-optic proper-ties. 10,11 Even films with chemically alternating layers could be prepared 12,13 corresponding to an artificial tetragonal AuFe compound of L1 0 structure not existing in equilibrium since Au and Fe fail to mix at room temperature. 14 In earlier work 15 it was retrieved that upon Fe deposition Au atoms segregate to the very film surface up to considerable Fe coverages, a finding repeatedly confirmed in subsequent work.…”

Magneto-optical spectra of Fe/Au artificial superlattices modulated by integer and noninteger atomic layers

“…For small periods (xр5) the spectral shape is quite similar to that of the L1 0 alloy with the main peak shifting toward higher energies, while for large periods (xу10) it was quite similar to that expected from a simulation assuming a simple stack of Fe and Au layers. 9 The characteristic 4 eV structure in the MOKE spectra showed a very similar peak shift with a͒ Electronic mail: satokats@cc.tuat.ac.jp increasing modulation period x, as observed in the MOKE spectra of ultrathin Fe layers sandwiched by Au. 10 Electronic energy band structures of ͓Fe (xML͒/ Au (xML)͔ N superlattices for integer x (1рxр6) were calculated by one of the authors by means of the linearized muffin-tin orbital method with atomic sphere approximation ͑LMTO-ASA͒ method.…”

“…One of the authors proposed the assignment from a simple analysis using density of states function. 9 FIG. 11.…”