Chemical substitution is an effective method for tailoring the electronic and magnetic properties of functional materials. In this work, we employ magneto-optical spectroscopy to investigate the behavior of the cycloid → homogenous ordering transition in Bi 1-xNd xFeO 3. From the magneto-optical response, we construct a B-T-x phase diagram that shows how the critical field decreases with Nd3 + substitution, an effect that we model with Ginzburg-Landau free energy and harmonic cycloid approximations. Compared with nonmagnetic impurities like La3 +, Nd3 + is a stronger quencher and yields nonlinear B C-x behavior. Spiral magnetic order is quenched when x∼0.2. With increasing temperature (T<90 K), the critical field rises gently, a consequence of magnetic anisotropy changes with temperature. These findings extend our understanding of charge-spin coupling and advance the development of magnetic ferroelectrics.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Jul 10 2012
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics