日本応用磁気学会誌
Online ISSN : 1880-4004
Print ISSN : 0285-0192
ISSN-L : 0285-0192
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不規則構造を有するCo2(Cr1-xFex)Alを用いた強磁性トンネル接合のTMR特性
岡村 進宮崎 彩手束 展規杉本 諭猪俣 浩一郎高橋 有紀子宝野 和博
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2006 年 30 巻 3 号 p. 366-369

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Polycrystalline and single crystalline thin films of Co2(Cr1-xFex)Al (x = 0.6, 1) full-Heusler alloys with different disordering were prepared on thermally oxidized Si and MgO(001) substrates, respectively, by the dc magnetron sputtering method. The magnetic tunnel junctions with a polycrystalline and single crystalline B2 type Co2FeAl (x =1) electrode demonstrate TMR of 70% and 75% at 5 K, respectively, which is larger than that of 65% at 5 K for Co75Fe25, indicating that the spin polarization for Co2FeAl is larger than that for Co75Fe25. The TMR for Co2FeAl with both the A2 and the B2, which is controlled by substrate heating, is almost the same, whereas for Co2(Cr0.4Fe0.6)Al the TMR increases with increasing the degree of ordering, corresponding to the first-principles calculations.

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© 2006 (社)日本応用磁気学会
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