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High-temperature magnetic properties of epsilon-Fe2O3

AuthorsGich, Martí ; Nogués, Josep ; Roig Serra, Anna ; Fauth, F.; García Muñoz, Josep Lluís
KeywordsIron oxide
Neutron diffraction
Issue Date2016
Citation61st Annual Conference on Magnetism and Magnetic Materials (2016)
AbstractThe epsilon-Fe2O3 phase is attracting great interest after the discovery of a huge coercivity (20kOe), magnetoelectric response and multiferroicity. These appealing physical properties stem from a complex structure, with four Fe3+ sublattices, and are also related to the existence of a substantial spin-orbit coupling. So, its complex structure favours magnetic frustration and successive magnetic and structural transitions. The collinear ferrimagnetic phase (Tc=500K) is substituted by two different incommensurate magnetic orderings on cooling below 150K and 110K respectively. In this work we have investigated the magnetic and structural properties of epsilon-Fe2O3 between room temperature and 925 K by means of magnetic, synchrotron and neutron diffraction measurements. The diffraction experiments were performed using high-resolution powder diffractometers at ALBA synchrotron and ILL neutron reactor. Upon heating, the saturation magnetization undergoes a monotonical decrease but the coercivity and remanence sharply drop between 480 and 500 K, as the net ordered ferromagnetic component. Above Tc=500K the compound is not paramagnetic but exhibit partial magnetic ordering with Pna'21' magnetic symmetry up to temperatures as high as 870 K. In contrast to its superhard behavior below 500 K, epsilon-Fe2O3 was found to exhibit soft magnetic properties in the high-temperature magnetic phase. Concurrent with this transition from superhard to soft ferrimagnetism, lattice anomalies indicating magnetostriction effects have been observed and described.
DescriptionResumen del póster presentado a la 61st Annual Conference on Magnetism and Magnetic Materials, celebrada en New Orleans, Louisiana (US) del 31 de octubre al 4 de noviembre de 2016.
Appears in Collections:(CIN2) Comunicaciones congresos
(ICMAB) Comunicaciones congresos
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