Magnetic properties of Fe-Cu alloys prepared by pulsed electrodeposition

Journal Article · Sun Nov 01 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3253725· OSTI ID:21361909

Noce, R D; Gomes, O D. M. ^[1]; Magalhaes, S D. de; Wolf, W; Castro, A C. de ^[2]; Guimaraes, R B ^[3]; Pires, M J. M.; Macedo, W A. A. ^[4]; Givord, D ^[5]

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1. Centre for Mineral Technology (CETEM), 21941-908 Rio de Janeiro, Rio de Janeiro (Brazil)
2. Instituto de Fisica, Universidade Federal do Rio de Janeiro (UFRJ), 21945-970 Rio de Janeiro, Rio de Janeiro (Brazil)
3. Instituto de Fisica, Universidade Federal Fluminense, 24210-346 Niteroi, Rio de Janeiro (Brazil)
4. Laboratorio de Fisica Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear, 30123-901 Belo Horizonte, Minas Gerais (Brazil)
5. Institut Neel, CNRS/UJF, BP 166, 38042 Grenoble-Cedex 9 (France)

Fe{sub x}Cu{sub 100-x} metastable alloys were prepared by pulsed electrodeposition for 5<x<85. The Fe-rich alloys crystallize in the bcc structure of alpha-Fe and the Fe-poor ones in the fcc structure of Cu. The magnetic properties of the ferromagnetic Fe-rich alloys (x>50) are reminiscent of those observed in Fe-Cu alloys prepared by other methods. The Curie temperature decreases regularly with decreasing x. In the Fe-poor alloys (x<=30), the observed properties indicate that Fe-rich clusters form within a Cu-rich matrix. In the x=10 alloy, the Fe clusters are found to be superparamagnetic at room temperature, but a superferromagnetic order develops below a critical temperature of about 120 K. It is suggested that the intercluster coupling is mediated by Ruderman-Kittel-Kasuya-Yosida interactions which are predominantly positive due to the very short intercluster distances.

• OSTI ID: 21361909
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 9; Other Information: DOI: 10.1063/1.3253725; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BCC LATTICES
BINARY ALLOY SYSTEMS
COPPER ALLOYS
CRITICAL TEMPERATURE
CURIE POINT
ELECTRODEPOSITION
FCC LATTICES
FERROMAGNETIC MATERIALS
IRON ALLOYS
IRON-ALPHA
MAGNETIC PROPERTIES
SUPERPARAMAGNETISM
TEMPERATURE RANGE 0273-0400 K
ALLOY SYSTEMS
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DEPOSITION
ELECTROLYSIS
ELEMENTS
IRON
LYSIS
MAGNETIC MATERIALS
MAGNETISM
MATERIALS
METALS
PHYSICAL PROPERTIES
SURFACE COATING
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE