AVS 62nd International Symposium & Exhibition
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuM

Invited Paper MI-TuM5
Complex Fluorides: A New Class of Multiferroic and Magnetoelectric Materials

Tuesday, October 20, 2015, 9:20 am, Room 230A

Session: Oxides, Fluorides, and Spin Structures
Presenter: David Lederman, West Virginia University
Authors: D. Lederman, West Virginia University
A. KC, West Virginia University
T.A. Johnson, West Virginia University
C. Cen, West Virginia University
A.H. Romero, West Virginia University
P. Borisov, West Virginia University
Correspondent: Click to Email
Transition metal fluoride antiferromagnets have been used to study the fundamental properties of exchange bias and magnetism at the interface between antiferromagnets and ferromagnets. The highly ionic nature of these compounds makes them ideal candidates for studying fundamental magnetic properties. Less studied are multiferroic fluoride compounds such as the orthorhombic BaMF4 or the perovskite NaMF3 materials, where M is a transition metal. Recent theoretical and computational work has suggested that the some of the BaMF4 compounds should be magnetoelectric and that the perovskite fluoride compounds in particular should have large canting of the antiferromagnetic structure which results in strong weak ferromagnetism. In this talk I will describe recent work in the growth of thin films of these materials using molecular beam epitaxy. Their magnetic properties were measured using SQUID magnetometry and their ferroelectric properties were measured using scanning probe microscopy and direct ferroelectric polarization measurements. For the BaMF4 compounds, we were able to confirm that the Ni and Co compounds are multiferroic, while the Fe compound is definitely not multiferroic. I will also discuss the growth of NaMnF3 thin films and their magnetic and dielectric properties as a function of temperature and magnetic fields.