Spin dynamics of amorphous Fe sub 90-x Ni sub x Zr sub 10
Conference
·
OSTI ID:5525698
- Oak Ridge National Lab., TN (USA)
Amorphous Fe{sub 90-x}Ni{sub x}Zr{sub 10} is a system that exhibits a relatively high degree of magnetic exchange frustration, which becomes stronger as the system approaches the composition of amorphous pure iron. Thus, while samples with moderate amounts of iron (x {ge} 5) are ferromagnetic, the samples with the highest concentration of iron (x {le} 1) behave like reentrant spin glasses. We have performed a detailed neutron scattering study of the spin-wave excitations in this system for x = 1, 5, 10, 20. In all cases well defined spin-wave excitations were observed below a transition temperature T{sub c} that decreased from 455 K (for x = 20) to 250 K (for x = 1). For x = 5, 10, 20 the spin-wave stiffness coefficient follows the temperature dependence expected for a conventional ferromagnet but the spin-wave excitations broaden considerably at low temperatures. For x = 1 the spin-wave stiffness coefficient softens at low temperatures and an elastic component of the scattering, associated with development of a spin glass order parameter, appears below T {approx}0.28T{sub c}. A coexistence of propagating spin-wave excitations and spin freezing phenomena is observed below this temperature down to T = 0.09T{sub c}. These results are discussed in terms of the relevant current theories. 30 refs., 5 figs., 1 tab.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5525698
- Report Number(s):
- CONF-891117-8; ON: DE90002474
- 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)
Low temperature spin waves in amorphous Fe/sub 90-x/Ni/sub x/Zr/sub 10/
Low-temperature spin waves in amorphous Fe/sub 90-//sub x/Ni/sub x/Zr/sub 10/
Journal Article
·
Tue May 01 00:00:00 EDT 1990
· Journal of Applied Physics; (USA)
·
OSTI ID:6838028
Low temperature spin waves in amorphous Fe/sub 90-x/Ni/sub x/Zr/sub 10/
Conference
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:5818054
Low-temperature spin waves in amorphous Fe/sub 90-//sub x/Ni/sub x/Zr/sub 10/
Journal Article
·
Fri Apr 15 00:00:00 EDT 1988
· J. Appl. Phys.; (United States)
·
OSTI ID:7202323