Gakel’–Turov oscillations in iron borate

• Published in: Journal of magnetism and magnetic materials Vol. 219; no. 3; pp. 340 - 348
• Main Authors: Mitsay, Yu.N., Skibinsky, K.M., Strugatsky, M.B., Korolyuk, A.P., Tarakanov, V.V., Khizhnyi, V.I.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2000; Elsevier Science
• Subjects: Birefringence of sound; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Iron borate; Magnetic anisotropy; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetoacoustic effect; Magnetomechanical and magnetoelectric effects, magnetostriction; Physics; Weak ferromagnet; Birefringence of sound; 75.50.−y; Magnetic anisotropy; 75.80.+q; Iron borate; Weak ferromagnet; 75.30.Gw; Magnetoacoustic effect; Inorganic compounds; Magnetic birefringence; Ternary compounds; Magnetoacoustic effects; Transition element compounds; Iron borates; Experimental study
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(00)00413-3

Dependence of the amplitude of transverse sound passed through a basal plate of easy-plane weak ferromagnet FeBO 3 on a magnetic field H, parallel to the plate is investigated in experiment at T=77 K. This dependence is of the oscillating form. The phenomenon is caused by magnetic birefringence of transverse sound, being the analog of Cotton–Mouton optical effect. In acoustics this effect is associated with magnetic additions appearing in elastic modules upon transition from a paramagnetic phase to an antiferromagnetic one. However, the theory of magnetoacoustic birefringence for homogeneously magnetized crystals, valid for MnCO 3, is unable to explain the experiment for FeBO 3. A model, taking into account the experimental boundary conditions and inhomogeneous distribution of magnetization in the sample of iron borate is constructed. Calculations based on this model describe the experiment satisfactorily.