35th Magnetic Materials Center Seminar
December 25, 2006, 10:30
7th floor seminar room, Sengen
Toward the ordering of FePt-SiO2 granular films at low temperature
T. O. Seki
At last my talk, it was reported that small particles and narrow size distribution in FePt-SiO2 granular films deposited at low temperature were achieved. However the degree of ordering to L10 phase was low, and the coercivity of this film was almost zero. It is necessary to promote the ordering with keeping this small particle. For this challenge, many studies have been reported, such as the deposition under high Ar pressure, addition of Ag and Pt-rich composition. In this work, I report my recent attempts for the ordering at low temperature.

Observation of TMR enhancement in spin-dependent resonance tunneling
K. Inomata
Spin dependent resonance tunneling is a new phenomenon in spintronics. We have already observed the oscillation of the differential conductance due to the quantum well states formed in epitaxial double barrier tunnel junctions. In this study we investigated the spin dependent tunneling for Cr/ultrathinFe/MgO/Fe junctions formed on a MgO(001) substrate. We have successfully fabricated the layered structure for an ultrathin Fe, and observed the quantum well states in a ultrathin Fe layer. We also demonstrate the TMR enhancement due to the spin-dependent resonance tunneling for the first time, which was observed even at room temperature.