Orientation dependence of magnetic properties in BiFeO3

Abstract

Abstract Through coordinate transformation approach, crystal orientation dependences of magnetic properties have been investigated in the three dimensional space for bismuth ferrite (BiFeO3). Permeabilities μ11′, μ33′, piezomagnetic constants q31′, q33′, and magnetoelectric coefficients α12′, α31′ along arbitrary orientations were presented based on magnetic and crystalline asymmetry characteristics of trigonal BiFeO3 below the Neel temperature. μ11′ is a constant while the max μ33′ = μ11′ =\u202f2.68 lies in [n\u2009k\u20090] axes. q31′ and q33′ show very similar orientation dependences with their absolute maximas (10−13\u202fm/A) both lying in directions at ϕ \u202f=\u202f30°, 90°, and 150° inside XOY plane. α12′ and α31′ show the contrary orientation dependences with their maximas (120\u202fmV/cm Oe) existing along [0\u20090\u20091] and [n\u2009k\u20090] axes, respectively. The results suggest that by adopting optimal directions, the magnetic parameters of BiFeO3 could be optimally used.