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Polarized Raman scattering in helimagnetic β‐MnO 2
Author(s) -
Yu X. L.,
Chen J.,
Wu S. X.,
Liu Y. J.,
Li S. W.
Publication year - 2008
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2017
Subject(s) - raman spectroscopy , chemistry , reflection high energy electron diffraction , raman scattering , rutile , reflection (computer programming) , electron diffraction , ion , molecular beam epitaxy , molecular vibration , diffraction , atomic physics , analytical chemistry (journal) , optics , epitaxy , physics , organic chemistry , layer (electronics) , computer science , programming language , chromatography
Abstract A rutile β‐MnO 2 film was grown on MgO substrate using plasma‐assisted molecular beam epitaxy (PAMBE) monitored by reflection high‐energy electron diffraction (RHEED). Polarized Raman spectra at various temperatures were obtained to investigate the influence of the helimagnetic structure on the vibrational modes of β‐MnO 2 . A red shift of E g modes indicates a gradual formation of spin angles between neighboring Mn 4+ ions. The intensities of the E g and A 1 g modes with y ‐polarized incidence increase remarkably below the Néel temperature. A new view as vibrational mode projection (VMP) indicates the interactions between the magnetic component of incident light and the helimagnetic structure. Copyright © 2008 John Wiley & Sons, Ltd.