Magnetoelectric multiferroics, where a ferromagnetic and a ferroelectric order coexist and
are coupled in a single phase, have been a hot topic in condensed matter physics for a long …

We propose a systematic analysis method for identifying essential parameters in various
linear and nonlinear response tensors without which they vanish. By using the Keldysh …

Neutron powder diffraction experiments reveal that C o 4 N b 2 O 9 forms a noncollinear in-
plane magnetic structure with C o 2+ moments lying in the ab plane. The spin-wave …

As a new magnetoelectric material, honeycomb-based antiferromagnet Fe 4 Nb 2 O 9 has
attracted a great deal of attention due to its prominent magnetoelectric (ME) coupling and …

Ni4Nb2O9 and Co4Nb2O9 have two different structures derived from corundum which show
different magnetic and electrical properties. The ferrimagnetism (FIM) associated with …

The magnetodielectric effect has been investigated for single crystals of a honeycomb
antiferromagnet Co 4 Nb 2 O 9. In addition to large magnetoelectric coupling, a …

Among the numerous exotic phenomena exhibited by honeycomb antiferromagnets, linear
magnetoelectricity in niobiates and tantalates of an A 4 M 2 O 9 formula has been attracting …

In order to explore the consequences of spin–orbit coupling on spin–phonon interactions in
a set of chemically similar mixed metal oxides, we measured the infrared vibrational …

The magnetic and structural properties of polycrystalline Co 4− x Ni x Nb 2 O 9 (x= 1, 2) have
been investigated by neutron powder diffraction, magnetization and heat capacity …

M 4 A 2 O 9 transition metal oxides, with M a divalent cation and A Nb or Ta, that exhibit a
structure derived from corundum constitute an interesting class of materials due to their …