We have detected a clear magnetic anisotropy in the temperature and field dependent Mn L2,3 magnetic circular dichroism (MCD) spectra of 28 A wide paramagnetic manganese oxide nanostripes, which we relate to ˚ the presence of a largely unquenched orbital moment revealed by MCD sum rule analysis. Polarization, angle, and temperature dependent linear dichroism spectra indicate that the observed anisotropy is related to a depletion of 3d states with ml = ±2 orbital quantum number in the ground state of the paramagnetic system. Strongly anisotropic electrostatic coupling provides an internal source of spatial symmetry breaking which might generally yield paramagnetic anisotropy phenomena in 3d oxide nanostructures.
Orbital anisotropy in paramagnetic manganese oxide nanostripes / S., Altieri; F., Allegretti; W., Steurer; S., Surnev; M., Finazzi; V., Sessi; N. B., Brookes; Valeri, Sergio; F. P., Netzer. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 87:(2013), pp. 241407-I-241407-5. [10.1103/PhysRevB.87.241407]
Orbital anisotropy in paramagnetic manganese oxide nanostripes
VALERI, Sergio;
2013
Abstract
We have detected a clear magnetic anisotropy in the temperature and field dependent Mn L2,3 magnetic circular dichroism (MCD) spectra of 28 A wide paramagnetic manganese oxide nanostripes, which we relate to ˚ the presence of a largely unquenched orbital moment revealed by MCD sum rule analysis. Polarization, angle, and temperature dependent linear dichroism spectra indicate that the observed anisotropy is related to a depletion of 3d states with ml = ±2 orbital quantum number in the ground state of the paramagnetic system. Strongly anisotropic electrostatic coupling provides an internal source of spatial symmetry breaking which might generally yield paramagnetic anisotropy phenomena in 3d oxide nanostructures.
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