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Abstract
A new metal-insulator nano-granular tunneling magnetoresistance (TMR) film made of (Fe-Co)-(Mg-Al-O) has been investigated. It is confirmed that the film has granular structure in which crystal Fe-Co granules are surrounded by an amorphous Mg-Al-O matrix. A large MR ratio of 11.8 % at room temperature is observed for a 42 vol.%(Fe0.6Co0.4)-(Mg-Al-O) film annealed at 395 °C. The electrical resistivity increases rapidly by annealing at above the changing point (500 °C). The changing point is about 300 °C higher than that of conventional (Fe-Co)-(Mg-F) nano-granular TMR films. The 42 vol.%(Fe0.6Co0.4)-(Mg-Al-O) film also exhibits less degradation in the MR ratio at high annealing temperatures such as 600 °C. These results suggest the (Fe-Co)-(Mg-Al-O) film is superior to the (Fe-Co)-(Mg-F) film in thermal stability.
Highlights
ARTICLES YOU MAY BE INTERESTED INKoyama Daido Steel Co., Ltd., 2-30 Daido-cho, Minami-ku, Nagoya 457-8545, Japan (Presented 7 November 2017; received 18 September 2017; accepted 13 November 2017; published online 29 December 2017)
It has been revealed that certain metal-insulator nano-granular films exhibit large tunneling magnetoresistance (TMR) effect
Such nano-granular TMR films have attracted much attention for magnetic sensor applications, since they possess no hysteresis in the magnetoresistance (MR) ratio vs. magnetic field (H) curve, and are fabricated by conventional industrial methods.[1,2,3,4,5,6,7,8,9]
Summary
Koyama Daido Steel Co., Ltd., 2-30 Daido-cho, Minami-ku, Nagoya 457-8545, Japan (Presented 7 November 2017; received 18 September 2017; accepted 13 November 2017; published online 29 December 2017)
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