Large Emission Power over 2 μW with High $Q$ Factor Obtained from Nanocontact Magnetic-Tunnel-Junction-Based Spin Torque Oscillator

Large Emission Power over 2 μW with High $Q$ Factor Obtained from Nanocontact Magnetic-Tunnel-Junction-Based Spin Torque Oscillator

We have developed a new type of nanocontact structure called a "sombrero-shaped" nano-contact for a spin torque oscillator (STO) based on magnetic tunnel junctions. This structure reduces the shunt current, which passes through the capping layer, and hence improves the magnetoresistance (M...

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Veröffentlicht in:Applied physics express 2013-11, Vol.6 (11), p.113005-113005-3
Hauptverfasser: Maehara, Hiroki, Kubota, Hitoshi, Suzuki, Yoshishige, Seki, Takayuki, Nishimura, Kazumasa, Nagamine, Yoshinori, Tsunekawa, Koji, Fukushima, Akio, Deac, Alina M, Ando, Koji, Yuasa, Shinji
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container_end_page 113005-3
container_issue 11
container_start_page 113005
container_title Applied physics express
container_volume 6
creator Maehara, Hiroki
Kubota, Hitoshi
Suzuki, Yoshishige
Seki, Takayuki
Nishimura, Kazumasa
Nagamine, Yoshinori
Tsunekawa, Koji
Fukushima, Akio
Deac, Alina M
Ando, Koji
Yuasa, Shinji
description We have developed a new type of nanocontact structure called a "sombrero-shaped" nano-contact for a spin torque oscillator (STO) based on magnetic tunnel junctions. This structure reduces the shunt current, which passes through the capping layer, and hence improves the magnetoresistance (MR) ratio to 46% compared with an MR ratio of 3% in conventional nano-contact structures. It also displays highly stable oscillation ($Q=350$) with high emission power over 2 μW. This is significant in the development of new spintronic devices such as nanosized microwave generators and highly sensitive nanoscale magnetic field sensors.
doi_str_mv 10.7567/APEX.6.113005
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title Large Emission Power over 2 μW with High $Q$ Factor Obtained from Nanocontact Magnetic-Tunnel-Junction-Based Spin Torque Oscillator
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