We systematically investigated the influence of the dead layer, the oxidation degree of naturally oxidized MgO, the structure of adjacent nonmagnetic metal layers on the damping parameter, and the perpendicular anisotropy of Ta(Ru)/Co20Fe60B20/MgO and MgO/Co20Fe60B20/Ta films using the vector network analyzer ferromagnetic resonance measurement technique. MgO/Co20Fe60B20/Ta film shows almost twice larger extrinsic damping than that for Ta/Co20Fe60B20/MgO film, whereas the perpendicular anisotropy is much smaller. This two-fold enhancement of damping parameter is successfully explained by the extrinsic damping arises from the dead layer at the CoFeB-Ta interface through the Elliott-Yafet mechanism in addition to the conventional spin-pumping model. Furthermore, we found that the oxidation degree of naturally oxidized MgO has no significant impact on the damping parameter, while the perpendicular anisotropy for MgO/Co20Fe60B20/Ta film is enhanced by longer oxidation time.
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7 March 2016
Research Article|
March 01 2016
Investigation of extrinsic damping caused by magnetic dead layer in Ta-CoFeB-MgO multilayers with perpendicular anisotropy
Noriyuki Sato;
Noriyuki Sato
1Department of Electrical Engineering,
Stanford University
, Stanford, California 94305, USA
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Kevin P. O'Brien;
Kevin P. O'Brien
2Intel Corporation,
Components Research
, Hillsboro, Oregon 97124, USA
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Kent Millard;
Kent Millard
2Intel Corporation,
Components Research
, Hillsboro, Oregon 97124, USA
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Brian Doyle;
Brian Doyle
2Intel Corporation,
Components Research
, Hillsboro, Oregon 97124, USA
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Kaan Oguz
Kaan Oguz
2Intel Corporation,
Components Research
, Hillsboro, Oregon 97124, USA
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Noriyuki Sato
1
Kevin P. O'Brien
2
Kent Millard
2
Brian Doyle
2
Kaan Oguz
2
1Department of Electrical Engineering,
Stanford University
, Stanford, California 94305, USA
2Intel Corporation,
Components Research
, Hillsboro, Oregon 97124, USA
J. Appl. Phys. 119, 093902 (2016)
Article history
Received:
June 16 2015
Accepted:
February 02 2016
Citation
Noriyuki Sato, Kevin P. O'Brien, Kent Millard, Brian Doyle, Kaan Oguz; Investigation of extrinsic damping caused by magnetic dead layer in Ta-CoFeB-MgO multilayers with perpendicular anisotropy. J. Appl. Phys. 7 March 2016; 119 (9): 093902. https://doi.org/10.1063/1.4941943
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