TY - JOUR
KW - Electricity
KW - Electronics
KW - Magnetism
KW - Article
KW - Priority journal
KW - Ferromagnetic material
KW - Electromagnetic field
AU - J.-H Park
AU - E Vescovo
AU - H.-J Kim
AU - C Kwon
AU - Ramamoorthy Ramesh
AU - T Venkatesan
AB - Half-metallic materials are characterized by the coexistence of metallic behaviour for one electron spin and insulating behaviour for the other. Thus, the electronic density of states is completely spin polarized at the Fermi level, and the conductivity is dominated by these metallic single-spin charge carriers. This exotic physical property could have a significant effect on technological applications related to magnetism and spin electronics. Some ferromagnetic systems, such as Heusler compounds and chromium dioxide, have been predicted theoretically to be half-metallic. However, a half-metallic system has not been demonstrated directly and the predictions are still in doubt. Here we report spin-resolved photoemission measurements of a ferromagnetic manganese perovskite, La0.7Sr0.3MnO3, which directly manifest the half-metallic nature well below the Curie temperature. For the majority spin, the photoemission spectrum clearly shows a metallic Fermi cut- off, whereas for the minority spin, it shows an insulating gap with disappearance of spectral weight at  0.6 eV binding energy.
BT - Nature
DO - 10.1038/33883
LA - eng
M1 - 6678
N1 - cited By 1059
N2 - Half-metallic materials are characterized by the coexistence of metallic behaviour for one electron spin and insulating behaviour for the other. Thus, the electronic density of states is completely spin polarized at the Fermi level, and the conductivity is dominated by these metallic single-spin charge carriers. This exotic physical property could have a significant effect on technological applications related to magnetism and spin electronics. Some ferromagnetic systems, such as Heusler compounds and chromium dioxide, have been predicted theoretically to be half-metallic. However, a half-metallic system has not been demonstrated directly and the predictions are still in doubt. Here we report spin-resolved photoemission measurements of a ferromagnetic manganese perovskite, La0.7Sr0.3MnO3, which directly manifest the half-metallic nature well below the Curie temperature. For the majority spin, the photoemission spectrum clearly shows a metallic Fermi cut- off, whereas for the minority spin, it shows an insulating gap with disappearance of spectral weight at  0.6 eV binding energy.
PY - 1998
SP - 794
EP - 796
T2 - Nature
TI - Direct evidence for a half-metallic ferromagnet
VL - 392
SN - 00280836
ER -