Crystal and magnetic structure of multiferroic hexagonal manganite

February 22, 2016
Crystal and magnetic structure of multiferroic hexagonal manganite
Crystal structures of paraelectric and ferroelectric phases. Credit: Sim et al.

Ever since Curie conjectured on "the symmetry in physical phenomena, symmetry of an electric field and a magnetic field", it has long been a dream for material scientists to search for this rather unusual class of material exhibiting the coexistence of magnetism and ferroelectricity in a single compound known as a multiferroic compound.

Multiferroic materials are a class of which exhibit a number of , in which at least two order parameters exist simultaneously; ferro- (or antiferro-) magnetic, ferroelectric and ferroelastic degrees of freedom. These properties give rise to a number of useful and practical applications such as memory devices and sensors. Even though multiferroic materials are relatively commonplace much is still not known about their molecular make-up and properties. This article [Sim et al. (2016), Acta Cryst. B72, 3-19; DOI: 10.1107/S2052520615022106] presents an extended and comprehensive review of the structure and multiferroic properties of the hexagonal rare-earth manganite RMnO3, in which there are ferroelectric and magnetic orders. Strong interaction between these orders causes a series of interesting properties of multiferroics. The review describes multiferroics with antiferromagnetic and ferroelectric orders. A commentary about this paper has also been commissioned [Pirogov (2016), Acta Cryst. B72, 1-2; DOI: 10.1107/S2052520616001062]

Thanks to the extensive volume of works carried out in this field worldwide over the past decade or so, the list of materials exhibiting multiferroic behaviour has expanded far beyond the few that were studied in Russia at the time of Curie's conjecture in the 1960s. This experimental renaissance of multiferroic physics gives a long overdue justification to the earlier pioneering theoretical works and judging by the pace of current research is set to continue well into the 21st Century.

Explore further: Superlattice design realizes elusive multiferroic properties

More information: Hasung Sim et al. Hexagonal MnO : a model system for two-dimensional triangular lattice antiferromagnets , Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials (2016). DOI: 10.1107/S2052520615022106

A. N. Pirogov. Polarization in MnO multiferroics , Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials (2016). DOI: 10.1107/S2052520616001062

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vidyunmaya
not rated yet Feb 23, 2016
sub: Cosmology Structure- 64 facets
Rmno3-very useful information on the structures is provided. Many thanks.
I am looking at similarity of structures- from cosmological perspectives.
SIVA Lingams may be depicted through 64 facets and the onset of material modes in nature -forms an interesting subject - Space Cosmology Vedas Interlinks-many fields- hexagonal structure- 4 flow modes- Five fields concepts are not understood by present day Cosmology groups that undermine Nature and philosophy- through super-imposition of ignorance - see ill-conceived logic in black-holes-Big-bang and now Gravity-waves.
Necessary orientation helps Science in philosophy inputs.www [dot]lulu [dot]com-spotlight-jnani108

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