Thermopower in specular spin valves

• Type: Article in International Conference Proceedings Book
• Date: 2006

Authors

pereira, a. m. (Author) FCUP; teixeira, j. m. (Author) FCUP; carpinteiro, f. (Author) Other; araujo, j. p. (Author) FCUP; pinto, r. (Author) Other; braga, m. e. (Author) Other; sousa, j. b. (Author) FCUP; veloso, a. (Author) Other; freitas, p. p. (Author) Other

Conference proceedings International

Title: JOURNAL OF ALLOYS AND COMPOUNDS

Pages: 240-243

Fall Symposium on Multicomponent Alloys and Intermetallic Compounds for Magnetic Applications and Nanotechnology

Warsaw, POLAND, SEP 05-09, 2005

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-004-GHK

DOI: 10.1016/j.jallcom.2005.12.097

Abstract (EN): Specular spin valves show enhanced giant magnetoresistance due to electron specular reflection at the ferromagnetic (FM)/nano-oxide layer (NOL) interfaces. The two NOLs are formed by the partial oxidation of the FM free and pinned layers. Here we study the thermopower of specular MnIr/CoFe/NOL/CoFe/Cu/CoFe/NOL spin valves (300-10 K). We show that the oxides making the NOL order antiferromagnetically at T-N approximate to 150 K. This magnetic ordering induces a large change in the magneto-thermopower (Delta S/S under a magnetic field) as T decreases below T-N, and also on the temperature derivative of the electrical resistivity. At low temperatures a quadratic dependence is observed in S(T), likely due to excitation of spin waves.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4