Relationship between the microstructure and the magnetic properties of nano-scale magnetic particles formed in a Cu-10 at% Ni-5 at% Co alloy

• Published in: Journal of the Korean Physical Society Vol. 63; no. 3; pp. 555 - 558
• Main Authors: Lee, Dong-Hae, Moriki, Takahiro, Takeda, Mahoto, Kang, Sung, Bae, Dong-Sik, Mizuguchi, Masaki, Takanashi, Koki
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.08.2013; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; SQUID magnetometer; Magnetic thermobalance; Microstructure; TEM; Cu-Ni-Co; Magnetic properties
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.63.555

Cu-10 at% Ni-5 at% Co specimens containing nano-scale magnetic particles were investigated with respect to the relationship between the microstructure and the magnetic properties, by using a transmission electron microscope (TEM), a SQUID magnetometer and a magnetic thermobalance. The present TEM observations revealed that small magnetic precipitates were formed in a copper matrix in a specific manner that has never been reported in conventional precipitation alloys consisting of non-magnetic elements. The SQUID measurements indicated that a specimen annealed for a short period had a large coercive force, although the force decreased for longer annealing treatments. The magnetic thermogravity scan in the temperature range of 300–1223 K showed that the alloy specimen had a paramagnetic state between two ferromagnetic regions.