Spin-resolved photoemission from polycrystalline Cr02 films shows a spin polarization (P) of nearly +100% for binding energies near 2 eV belo~the Fermi level (El. -). Despite the metallic resistivity behavior, extremely low intensity is observed in the photoemission spectra near EF. Our findings are in contrast to recent band-structure calculations, predicting Cr02 to be a half-metallic ferromagnet with I' =+100% at Ep. PACS numbers: 75.50.Cc, 71.25.Pi, 79.60.Cn The ferromagnet Cr02 is one of the technologically most important transition-metal oxides. But surprisingly enough, its electronic structure is up to now an open question.A first qualitative model was proposed by
Ultrafast optical techniques are used to develop new time-resolved probes of magnetic dynamics. Picosecond-scale magnetic fleld pulses are launched from a photoconductive switch and applied to small samples which are then probed by time-delayed optical pulses, yielding temporal information in a conventional stroboscopic manner. Characteristics of the magnetic fleld pulses are described, and illustrated through measurements of rapid relaxation effects in europium sulflde Alms at low temperatures.
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