Title :
Giant Inverse Tunneling Magnetoresistance in Single CrO_2 / Vacuum / Ni_80Fe_20 Using Conductive AFM
Author :
Suzuki, K. ; Hoshino, J. ; Itoh, M. ; Hiratsuka, T. ; Sawada, A.
Author_Institution :
Miyagi Nat. Coll. of Technol., Natori
Abstract :
The chromium dioxide (CrO2) is a half metallic ferromagnet which has both the metallic and semiconductive spin bands.The tunneling magnetoresistance (TMR) has been measured in single CrO2 deposited on (110) TiO2/vacuum/ Ni80Fe20 film on the AFM cantilever at room temperature. The behavior showed the giant inverse type of the TMR and the values of the TMR ratio from -74% to -63% were estimated using the experimental results, which means the spin polarization of-100% in CrO2. It was estimated that the surface of CrO2 has the insulator layer with the thickness of about 8~10[nm].
Keywords :
atomic force microscopy; chromium compounds; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic multilayers; magnetic thin films; nickel alloys; spin polarised transport; tunnelling magnetoresistance; CrO2-Ni80Fe20; TiO2; chromium dioxide; conductive AFM; giant inverse tunneling magnetoresistance; half metallic ferromagnet; insulator layer; semiconductive spin bands; spin polarization; temperature 293 K to 298 K; Educational institutions; Force measurement; Insulation; Magnetic domains; Magnetic field measurement; Magnetic fields; Magnetic films; Magnetization; Temperature; Tunneling magnetoresistance;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.375575
