Anomalous spin-wave behavior in the magnetic alloy Fe/sub x/Cr/sub 1-x/
Neutron scattering methods are employed to study the temperature and magnetic field dependence of the spin dynamics in the alloy Fe/sub x/Cr/sub 1-x/ for x = 0.34, 0.28, 0.26, 0.24, and 0.22. For x = 0.34 and 0.28, the system orders ferromagnetically and exhibits well-defined spin waves throughout the ferromagnetic phase. For x< or =0.26, ferromagnetism is also present but at low temperatures a spin-glass-like phase exists. For these concentrations the spin-wave excitations are observed within the ferromagnetic phase but as the temperature is lowered towards the spin-glass regime the spin-wave frequency decreases. At low temperatures, within the spin-glass reigme, no well-defined excitations are present, but an intense quasielastic peak is observed. Application of a magnetic field causes a reemergence of the spin-wave excitations.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 5884293
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 24:11
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spin dynamics of amorphous Fe sub 90 minus x Ni sub x Zr sub 10 (invited)
Investigation of the ferromagnetic-spin glass transition in a-(Fe/sub 77/Cr/sub 23/)/sub 75/P/sub 16/B/sub 6/Al/sub 3/