Magnetization and magnetoresistance in melt-spun Cu{sub 80}Fe{sub 5}Ni{sub 15}
Magnetization and magnetoresistance (MR) were studied (0{lt}H{lt}70kOe, 4.2K{lt}T{lt}300K) in as-cast and annealed (T{sub an}=400, 450, and 500{degree}C) samples of melt-spun Cu{sub 80}Fe{sub 5}Ni{sub 15}. Field-cooled magnetization curves, when compared with the Curie{endash}Weiss law, suggest the presence of antiferromagnetic interactions ({Theta}={minus}57K) between nanoparticles for T{sub an}=450 and 500{degree}C. Antiferromagnetic interactions have been predicted when dipolar interactions dominate Ruderman{endash}Kittel{endash}Kasuya{endash}Yosida interactions in large particles. Here antiferromagnetic interactions are attributed to particles roughly 4 to 5 nm in size. The largest MR value (MR{similar_to}17% at H=70kOe and T=10K) is found for the as-cast material. For samples annealed at 400{degree}C, MR curves are linear in H above 10 kOe and are in qualitative agreement with a model which considers short-range magnetic scattering by particles of different sizes. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204035
- Journal Information:
- Journal of Applied Physics, Vol. 89, Issue 11; Other Information: DOI: 10.1063/1.1357121; Othernumber: JAPIAU000089000011007296000001; 259111MMM; PBD: 1 Jun 2001; ISSN 0021-8979
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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