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25 April 2024 |
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Structural and magnetic properties of Cr-diluted CoFeB | | Yishen Cui
; Manli Ding
; S. Joseph Poon
; T. Paul Adl
; S. Keshavarz
; Tim Mewes
; Stuart A. Wolf
; Jiwei Lu
; | | Date: |
27 Sep 2013 | | Abstract: | The crystallization process and the magnetization of Cr diluted CoFeB was
investigated in both ribbon samples and thin film samples with Cr content up to
30 at. %. A primary crystallization of bcc phase from an amorphous precursor in
ribbon samples was observed when the annealing temperature rose to between 421
oC and 456 oC, followed by boron segregation at temperatures between 518 oC and
573 oC. The two onset crystallization temperatures showed strong dependences on
both Cr and B concentrations. The impact of Cr concentration on the magnetic
properties including a reduced saturation magnetization and an enhanced
coercive field was also observed. The magnetizations of both ribbon samples and
thin film samples were well fitted using the generalized Slater-Pauling curve
with modified moments for B (-0.94 {mu}B) and Cr (-3.6 {mu}B). Possible
origins of the enhanced coercive field were also discussed. We also achieved a
damping parameter in CoFeCrB thin films at the same level as Co40Fe40B20, much
lower than the value reported for CoFeCrB films previously. The results suggest
a possible advantage of CoFeCrB in reducing the critical switching current
density in Spin Transfer Torque Random Access Memory (STT-RAM). | | Source: | arXiv, 1309.7331 | | Services: | Forum | Review | PDF | Favorites | |
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