Some antiferromagnetic resonance measurements in $\alpha$-Fe2O3
- 1 February 1968
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 1 (1), 169-178
- https://doi.org/10.1088/0022-3719/1/1/320
Abstract
Millimetre wave antiferromagnetic resonance experiments have been made in α-Fe2O3 using both d.c. and pulsed magnetic fields. Both the weak-ferromagnetic modes above the Morin transition temperature and the usual low-temperature antiferromagnetic resonance were examined. The theoretical expression for the frequency dependence of the low-frequency weak-ferromagnetic mode has been verified up to 40 kG. The angular dependence of this mode at 687 Gc/s shows a departure from theory, however, although lower-frequency measurements do not. The angular dependence of the high-frequency weak-ferromagnetic mode observed at 142 Gc/s and 273 °K is in satisfactory agreement with theory. The low-temperature antiferromagnetic resonance for H0 along the c axis is similar to previous results; however, off-axis the resonance is observed to greater angles than expected, possibly as a result of a non-zero canting field when the spins deviate from the c axis. Near the Morin transition temperature metamagnetic behaviour is observed and the results are discussed with reference to previous measurements.Keywords
This publication has 35 references indexed in Scilit:
- Effect of Antisymmetric Exchange Interaction on the Magnetization and Resonance in AntiferromagnetsPhysical Review B, 1967
- Magnetocrystalline Anisotropy of Pure and Doped HematitePhysical Review B, 1967
- Antiferromagnetic to weak ferromagnetic transition and the temperature dependence of the transverse susceptibility in hematite below the Morin transitionSolid State Communications, 1966
- Neutron diffraction measurements on pure and doped synthetic hematite crystalsPhilosophical Magazine, 1965
- Magnetic Anisotropy in Antiferromagnetic Corundum-Type SesquioxidesPhysical Review B, 1965
- Mössbauer Studies of Spin Flop in Antiferromagnetic HematiteJournal of Applied Physics, 1965
- Spin flopping in synthetic hematite crystalsPhysics Letters, 1964
- Curie Point and Origin of Weak Ferromagnetism in HematitePhysical Review B, 1962
- Magnetic Resonance in MnCO3Journal of the Physics Society Japan, 1960
- Magnetic Resonance inPhysical Review B, 1954