Magnetic structure of Ba2Mg2Fe12O22 under the magnetic field

Ba2Mg2Fe12O22 has a strong coupling between electric polarization P and magnetization M. To understand the multiferroic properties of the system, we performed crystal structural and precise magnetic structural analyses of Ba2 Mg2Fe12O22 under a magnetic field (T = 4K, H = 0.3T) using 4 circle neutron diffractometer (FONDER) at JRR-3M Tokai. We collected 105 points of magnetic scattering for q = (0,0, 3/2) and over 150 points of fundamental scattering which contains ferri magnetic component. Using the part of these data, we reinvestigate magnetic struture of Ba2Mg2Fe12O22, in which 14 (Mg,Fe) sites have been included.