Spin-spin relaxation near the curie point |
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| Affiliation: | 1. Department of Physics, Texas A & M University at Qatar, Education City, Doha 23874, Qatar;2. NanoMagnetism and Modeling Team, IMMM UMR 6283, University du Maine - LUNAM, 72085 Le Mans, France;3. Science Department, American University of Technology, Fidar Campus, Halat, Lebanon;4. American University of the Middle East, College of Engineering and Technology, Egaila, Kuwait;5. Qatar Energy and Environment Research Institute, Qatar Foundation, PO Box 5825, Doha, Qatar;1. Departamento de Física, Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, 30510-000, MG, Brazil;2. Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, 30510-000, MG, Brazil |
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| Abstract: | The electronic spin-spin relaxation time, T2, is calculated for Heisenberg ferromagnets in the region immediately above the Curie point. The calculation, which pertains to zero field, predicts that 1/T2 diverges as χT3/4 where χT is the isothermal susceptibility. The relative efficiencies of the dipolar spin-spin relaxation and exchange induced spin diffusion are compared. For systems with parameters comparable to EuO spin-spin relaxation dominates for temperatures such that the ratio of the correlation length to lattice parameter is greater than two. In systems having the parameters of iron dipolar effects are much less important. |
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