Glassy magnetic behavior in nanocrystalline mechanically alloyed Fe–W–Ag

• Published in: Journal of magnetism and magnetic materials Vol. 231; no. 2; pp. 291 - 293
• Main Authors: De Toro, J.A, Arranz, M.A, Barbero, A.J, López de la Torre, M.A, Riveiro, J.M
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2001; Elsevier Science
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fine-particle systems; Interacting particles; Magnetic properties and materials; Mechanical alloying; Metals. Metallurgy; Nanocrystalline; Physics; Small particles and nanoscale materials; Spin-glass behavior; Studies of specific magnetic materials; Spin-glass behavior; Mechanical alloying; Interacting particles; Nanocrystalline; Spin glasses; Magnetization; Magnetic cluster; Ternary alloys; Magnetic hysteresis; Iron alloys; Superparamagnetism; Experimental study; Magnetic susceptibility; Micromagnetism; Particle interactions; Coercive force; Tungsten alloys; Silver alloys; Nanocrystal; Transition element alloys
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(01)00159-7

The origin of the spin-glass-like low-temperature phase in mechanically alloyed Fe 30W 40Ag 30 has been investigated with hysteresis loops, AC and DC susceptibility measurements. The magnetic glassy behavior is revealed by the characteristic irreversibility between the zero-field-cooled (ZFC) and the field-cooled (FC) magnetization, and by the small frequency sensitivity of the AC susceptibility vs. temperature peak. The collective freezing of interacting nanoclusters is suggested as the mechanism responsible for the observed properties.