Spin-Transfer-Torque Oscillator with an Antiferromagnetic Exchange-Coupled Composite Free Layer

Volvach, I.; Kent, A. D.; Fullerton, E. E.; Lomakin, V.

doi:10.1103/physrevapplied.18.024071

Title: Spin-Transfer-Torque Oscillator with an Antiferromagnetic Exchange-Coupled Composite Free Layer

Journal Article · Fri Aug 26 00:00:00 EDT 2022 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.18.024071· OSTI ID:1979656

^[1];

^[2]; Fullerton, E. E. ^[1]; Lomakin, V. ^[1]

Univ. of California, San Diego, CA (United States); Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research
New York Univ. (NYU), NY (United States). Center for Quantum Phenomena

We present an antiferromagnetically exchange-coupled composite (soft and hard layers) spin torque oscillator (AF-ECC STO) and demonstrate its operation via both analytical and micromagnetic modeling. The operation exploits the exchange field due to the antiferromagnetic coupling between soft and hard sublayers of the free layer as well as on the easy-plane anisotropy of the soft sublayer. Optimized AF-ECC STO structures can generate large-amplitude magnetization oscillations, which can be tuned over a broad frequency range with precessions mostly generated by the soft layer. We demonstrate that the AF-ECC STO structure offers flexibility in current control of the oscillation frequency and magnetization angle for realistic material parameters.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0019273; ACI-1548562; ACI-1445506

OSTI ID:: 1979656

Journal Information:: Physical Review Applied, Vol. 18, Issue 2; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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