Influence of MgO Barrier Quality on Spin-Transfer Torque in Magnetic Tunnel Junctions

Tiwari, Dhananjay; Sharma, Raghav; Heinonen, O. G.; Akerman, J.; Muduli, P. K.

doi:10.1063/1.5005893

Influence of MgO Barrier Quality on Spin-Transfer Torque in Magnetic Tunnel Junctions

Journal Article · Mon Jan 08 00:00:00 EST 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5005893· OSTI ID:1419948

Tiwari, Dhananjay ^[1]; Sharma, Raghav ^[1]; Heinonen, O. G. ^[2]; Akerman, J. ^[3]; Muduli, P. K. ^[1]

Indian Inst. of Technology (IIT), Delhi (India). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Gothenburg (Sweden). Dept. of Physics; KTH Royal Inst. of Technology, Stockholm (Sweden). Materials and NanoPhysics, School of Engineering Sciences

Here, we studied the bias dependence of spin transfer torque in the MgO-based magnetic tunnel junction using a field-modulated spin torque ferromagnetic resonance measurement technique for three devices with tunneling magnetoresistances (MRs) of 60%, 67%, and 73%, respectively. The devices with a lower MR ratio showed the presence of multiple modes, while the device with higher MR (73%) showed a single resonance mode. We found a lower out-of-plane torkance in our devices compared to the in-plane torkance. The out-of-plane torque is linear with applied bias, while the bias dependence of in-plane torque shows a strong dependence on the MR ratio and hence the barrier quality.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: India Department of Science and Technology; Swedish Foundation for Strategic Research (SSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1419948

Alternate ID(s):: OSTI ID: 1416222

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 2 Vol. 112; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Influence of MgO Barrier Quality on Spin-Transfer Torque in Magnetic Tunnel Junctions

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