Anomalous spin-wave behavior in the magnetic alloy Fe/sub x/Cr/sub 1-x/

Journal Article · Tue Dec 01 04:00:00 EST 1981 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.24.6661· OSTI ID:5884293

Shapiro, S M; Fincher, Jr, C R; Palumbo, A C; Parks, R D

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), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 24:11; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ALLOYS
CHROMIUM ALLOYS
COHERENT SCATTERING
DIFFRACTION
FERROMAGNETISM
IRON ALLOYS
MAGNETIC MATERIALS
MAGNETISM
MATERIALS
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
SCATTERING
SPIN GLASS STATE
SPIN WAVES
TEMPERATURE DEPENDENCE