Details

Autor(en) / Beteiligte

• Cui, Yishen
• Ding, Manli
• Joseph Poon, S.
• Paul Adl, T.
• Keshavarz, S.
• Mewes, Tim
• Wolf, Stuart A.
• Lu, Jiwei

Titel

Structural and magnetic properties of Cr-diluted CoFeB

Ist Teil von

• Journal of applied physics, 2013-10, Vol.114 (15)

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The crystallization process and the magnetization of Cr diluted CoFeB were 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 between 421 °C and 456 °C, followed by boron segregation at temperatures between 518 °C and 573 °C. 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 μB) and Cr (−3.6 μB). 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.