Download Core Level Spectroscopies for Magnetic Phenomena: Theory and by H. C. Siegmann (auth.), Paul S. Bagus, Gianfranco Pacchioni, PDF

By H. C. Siegmann (auth.), Paul S. Bagus, Gianfranco Pacchioni, Fulvio Parmigiani (eds.)

For a number of years, center point spectroscopies and different, c\osely comparable, electron spectroscopies have supplied very necessary information regarding the atomic composition, the geometric constitution, and the digital constitution of condensed subject. lately, those spectroscopies have additionally been used for the research of magnetic houses; such experiences have an excellent strength to increase our wisdom and realizing of magnetic structures. This quantity collects the lectures provided on the NATO complex learn Institute on "Core point Spectroscopies for Magnetic Phenomena: idea and scan" held on the Ettore Majorana Centre, Erice, Sicily, on 15 to 26 may perhaps 1994. the subjects thought of on the ASI lined quite a lot of matters concerning using core-level and similar spectroscopies to review magnetic phenomena. There are a wide and starting to be variety of functions of those spectroscopies to the research of magnetic fabrics; an enormous goal of the ASI was once to stimulate additional progress. the themes lined on the ASI might be positioned into 3 normal teams: 1) primary rules of middle point spectroscopies; 2) easy points of magnetic phenomena; and, three) the combo of the 2 earlier themes embodied in functions of the spectroscopies to magnetism. In all 3 teams, theoretical interpretations as weH as experimental measurements have been offered, usually either one of those points have been coated in one lecture or sequence oflectures. The theoretical remedies ofthe spectroscopies as weH as of the magnetic phenomena support to set up a framework for realizing a few of the experimental measurements on magnetic materials.

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Extra resources for Core Level Spectroscopies for Magnetic Phenomena: Theory and Experiment

Example text

The shift in binding energy for this peak suggests that we may associate it with Fe3+ valency. This together with the observation that it is spin polarized, suggests that the initial oxide is of the ferrimagnetic form 'Y-F~03' The observation that the substrate Fe emission is dominated by minority spin electrons but the initial oxide is dominated by majority spin emission suggests that the moments on the outer Fe ions associated with the oxide are antiferromagnetically coupled to the moments of the substrate via a superexchange mechanism involving subsurface atoms.

1 L Oxygen 5 4 3 2 1 EF 5 4 3 2 1 E F Binding Energy (eV) Figure 2. Spin integrated and spin resolved photoemission spectra recorded along the surface normal for photons of incidcnt cnergy 52 eY. the angle of incidence corresponds to p-polarizcd light (70 0 ). lL of o:\ygen. Figure 2 shows an example of a minority spin even symmetry state that has been identified on the (001) surface of Fe 9 , 10 The surface character of the state is confirmed through it's sensitivity to oxygen adsorption; it's symmetry is determined from its sensitivity to the angle of incidence of the light.

A typical example is given by the comparison between a closed shells and a shell with one hole; in the former case there is no excitation generating resonance while this can be very sU'ong in the second case. For example Yb metal has the fl4 configuration so that there is no 4d-4f transition and no resonance in 4f emission; as soon as the surface is oxidized so me Yb atoms go to the fU configuration opening the 4d-4f channel and generating a sU'ong Fano lineshape at the crossing of the core 4d level 15 .

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