Structural characterization of MnNi and MnPt antiferromagnetic materials for spintronic applications

• Type: Article in International Scientific Journal
• Date: 2008

Authors

teixeira, j. m. (Author) Other; ventura, j. (Author) REIT; araujo, j. p. (Author) FCUP; sousa, j. b. (Author) FCUP; amaral, v. s. (Author) Other; negulescu, b. (Author) Other; rickart, m. (Author) Other; freitas, p. p. (Author) Other

Journal

Title: Journal of Non-Crystalline Solids

Vol. 354 No. 2585

Pages: 5275-5278

ISSN: 0022-3093

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 2 Citations

Other information

Authenticus ID: P-003-TKA

DOI: 10.1016/j.jnoncrysol.2008.05.076

Abstract (EN): MnNi and MnPt become antiferromagnetic (AFM) when annealed at high enough temperatures, for which a face-centered cubic (fcc) to face-centered tetragonal (fcc) structural transition occurs. Thus, structural information is essential when optimizing exchange bias in these materials. We performed structural (Xray diffraction), magnetic (Magneto-Optical Kerr effect) and magneto-transport (magnetoresi stance) measurements on MnNi based spin valves subjected to different annealing procedures and MnPt/CoFe bilayers with different MnPt thicknesses. We show that high annealing temperatures can in fact lead to the fct anti ferromagnetic phase in both materials, but the annealing procedure is also an important factor on the obtained exchange field values. Also, MnPt/CoFe bilayers allowed us to probe the influence of average AFM-grain size on exchange bias.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4