Gakel’–Turov oscillations in iron borate

Fe x Ga1−x BO3 single crystals: synthesis and characterization

“…The existence of natural non-basal faces has allowed finding out and describing surface magnetism caused by specific surface anisotropy [6,7]. Another effect observed only in bulk crystals is magnetic birefringence of sound [4]. The solution in the melt technique allows obtaining thin, 0.05 0.1 mm along the trigonal C 3 axis [16] and up to 10 mm in the basal plane (0001) [16] by Ga 3? in Fe x Ga 1-x BO 3 .…”

Acoustic resonances in antiferromagnet FeBO3

“…It proved possible to analyze the experimental dependences o rez (H) [2] on the basis of our models [3,4] that describe the peculiarities of birefringence of sound in this crystal. The theory of magnetic linear birefringence of transverse sound in a trigonal easy-plane antiferromagnet with weak ferromagnetism was developed in the work [5].…”

“…One can improve the agreement with experiment including into the theory the experimental boundary conditions, caused by mechanical contact between the piezotransducers and the basal faces of the crystal. Because of strong magnetoelastic coupling in Iron Borate [3], such boundary conditions should affect significantly the magnetic state of the crystal, thus changing the parameters of the sound wave in the sample. For adequate description of sound birefringence effects in the crystals of Iron Borate type, it is therefore necessary to allow for the boundary conditions.…”

“…For adequate description of sound birefringence effects in the crystals of Iron Borate type, it is therefore necessary to allow for the boundary conditions. Let us consider the following simplest model [3,4]. Deformations in the crystal, caused by mechanical boundary conditions, lead through magnetoelastic coupling to the appearance of induced uniaxial magnetic anisotropy in the basal plane.…”

“…where a is the angle between the easy axis (EA) for the antiferromagnetic vector and the magnetic field direction; y is the angle between the EA and the antiferromagnetic vector [3]; M 0 is the sublattice magnetization; a is the induced uniaxial magnetic anisotropy constant. Taking a in Eq.…”