2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Size bistability in multiferroic nanoparticles

5 Jun 2019, 12:00
ASB 10900 (Simon Fraser University)

ASB 10900

Simon Fraser University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) W1-9 Condensed matter systems & related: experiment & theory (DCMMP) | systèmes de matière condensée et expérience et théorie connexes (DPMCM)


Mr Marc Allen (University of Victoria)


Most multiferroic materials with coexisting ferroelectric and magnetic order exhibit cycloidal antiferromagnetism with wavelength much larger than lattice spacing. The prototypical example is bismuth ferrite (BiFeO$_3$ or BFO), a room-temperature multiferroic considered for a number of technological applications, including magnetic memories with electric-write capability. While most applications requires small sizes such as nanoparticles, little is known about the state of these materials when their sizes are comparable to the cycloid wavelength. This work describes a theory of cycloid magnetism in nanoparticles. It is argued that magnetic anisotropy close to the surface has a huge impact on the ground state cycloidal wavevector, leading to several observable consequences. For certain sizes the cycloidal wavevector is bistable, an effect that may be exploited in the design of novel memory devices.

Primary authors

Mr Marc Allen (University of Victoria) Ian Aupiais (Université Paris Diderot) Dr Maximilien Cazayous (Université Paris Diderot) Prof. Rogério de Sousa (University of Victoria)

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