Heliconical magnetic order and field-induced multiferroicity of the Co2Y-type hexaferrite Ba0.3Sr1.7

Abstract

Using magnetoelectric measurements and neutron diffraction, we investigated multiferroic properties of Co 2 Y hexaferrite Ba 0.3 Sr 1.7 Co 2 Fe 12 O 22 in zero and finite magnetic field (H ⊥ c). Upon zero-field cooling, a longitudinal heliconical magnetic structure was observed below 280 K, which involves incommensurate planar helical ordering. When the magnetic field was applied perpendicular to its c axis, electric polarization was observed and the incommensurate ordering was replaced by a commensurate one as commonly observed in other hexaferrites. Electric polarization remained at its maximum during field reversal at 10 K, which indicates that magnetic anisotropy within the basal planes stabilizes the field-induced electric polarization.

Electric and magnetic properties of Y-type Ba2Mg2Fe12O22 hexaferrites with various Co doping

“…All transition temperatures increase with increasing Co content, which results from the fact that Co 2? ions can contribute to the enhancement of the magnetic ordering temperatures [40]. However, for x = 0.8 sample, the magnetic transition temperature T 2 is less than that for the x = 0.4 sample.…”

Analysis of the alternating current conductivity and magnetic behaviors for the polycrystalline Y-type Ba0.5Sr1.5Co2(Fe1-xAlx)12O22 hexaferrites

“…The latter is likely to correspond to the magnetic transition from the collinear ferrimagnetic to the spiral magnetic structure. 8,39 T N and T S were derived from the inflection points defined by the minimum of dM/dT from the M-T curve. Fig.…”

“…Recently, Lee et al 8 found that Sr-doped single crystalline Co 2 Y ferrite exhibits a longitudinal conical magnetic structure below 280 K upon zero-field cooling. Such spin structure is able to turn into transverse conical (or slanted conical) magnetic structure under a magnetic field and hence the electric polarization can be produced according to the inverse Dzyaloshinskii-Moriya mechanism or spin current model.…”

The effects of Co-Ti co-doping on the magnetic, electrical, and magnetodielectric behaviors of M-type barium hexaferrites

“…5 6 It was revealed that the magnetically controllable ferroelectricity can be induced with a complicated cycloidal spin order in certain hexaferrites, which has been well described with the spin current model or inverse Dzyaloshinskii-Moriya interaction model. 1,[6][7][8][9] In these spiral magnets, the magnetic order and ferroelectricity are inherently coupled and thus pronounced ME effects could be expected. Such spiral magnetic order induced multiferroicity and ME effects have been extensively reported in transition metal magnates (e.g.…”