Soft Magnetic Properties in Nano-scale Inhomogeneous Ni3Mn Alloys

Autor:	Motofumi Homma, Kazuyuki Sawaguchi, Teiko Okazaki
Rok vydání:	2000
Předmět:	Materials science Ferromagnetism Condensed matter physics Magnetic shape-memory alloy Alloy General Engineering engineering Intermetallic Giant magnetoresistance engineering.material Coercivity Nanocrystalline material Superparamagnetism
Zdroj:	Materials Transactions, JIM. 41:1150-1153
ISSN:	2432-471X 0916-1821
Popis:	We have observed superparamagnetic behaviors and giant magnetoresistance in Ni 3 Mn alloy annealed at 673 and 693 K for several periods. The coercive force is small of 0.14 ∼ 0.44 kA.m -1 in these inhomogeneous alloys. The average size of the ferromagnetic cluster increases from ∼2.8 to ∼10nm with long-range ordering. The saturation magnetization also increases with a volume fraction, e, in the ordered regions and reaches to 0.92 T at e ∼ 80% where the alloy is ferromagnetic. These results suggest that the present Ni 3 Mn alloys are magnetically soft due to the nanocrystalline morphology: ordered ferromagnetic domains with nanometer in size are distributed in a disordered nonmagnetic matrix.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::23026a253496d3acede84d012c25a0a8 https://doi.org/10.2320/matertrans1989.41.1150 Zobrazit plný text záznamu