Accession Number:

AD0419634

Title:

FAR INFRARED ANTIFERROMAGNETIC RESONANCE IN MnO AND NiO,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY

Personal Author(s):

• Sievers,A.J.
• Tinkham,M.

Report Date:

1963-01-01

Pagination or Media Count:

25.0

Abstract:

The uniaxial dipolar anisotropy in antiferro magnetic MnO and NiO aligns the two opposing sublattice moments in an easy 111 plane. The two normal modes for small oscillations of the sublattice magnetizations about a preferred direction within this plane are both nondegenerate and linearly polarized. The high frequency mode has been observed at low temperatures 2 K at 27.5 and 36.6 cm in MnO and NiO, respectively. In agreement with the unobservably small second order Zeeman shift expected for these nonde generate modes, a 10.7 koe field was found to have no effect on the observed resonance fre quencies. Increasing the sample temperature decreases the frequency of the mode in each case. Author

Descriptors:

• *ANTIFERROMAGNETISM
• RESONANCE
• OXIDES
• FREQUENCY
• TEMPERATURE
• NEUTRON DIFFRACTION
• ANISOTROPY
• INFRARED OPTICAL SYSTEMS
• CRYSTAL STRUCTURE
• BRILLOUIN ZONES
• SYMMETRY
• INFRARED PHENOMENA
• CRYSTAL LATTICES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE