多铁性ErMnO3薄膜中氧空位诱导的重入自旋玻璃行为
Oxygen vacancy induced re-entrant spin glass behavior in multiferroic ErMnO3 thin films
摘要：
在Pt（111）/Al_2 O_3（0001）和YSZ（111）衬底上制备的六方晶系ErMnO_3外延薄膜在低温下具有铁电性和磁有序性。随着温度的降低，ErMnO 3薄膜首先表现出反铁磁性。在较低的温度下，在较低的氧分压下沉积的薄膜表现出自旋玻璃行为。这种重入自旋玻璃行为归因于在六方几何结构中的反铁磁相互作用和由来自氧空位的过量电子引起的Mn价态变化引起的铁磁相互作用之间的竞争。
英文摘要：
Epitaxial thin films of hexagonal ErMnO3 fabricated on Pt(111)/Al2O3(0001) and YSZ(111) substrates exhibited both ferroelectric character and magnetic ordering at low temperatures. As the temperature was reduced, the ErMnO3 films first showed antiferromagnetism. At lower temperatures, the films deposited at lower oxygen partial pressures exhibited spin glass behavior. This re-entrant spin glass behavior was attributed to competition between an antiferromagnetic interaction in the hexagonal geometry and a ferromagnetic interaction caused by a change in Mn valence induced by excess electrons from the oxygen vacancies.
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