Recent Advances in Nanocontact Spin-Torque Oscillators

Randy K. Dumas; Sohrab R. Sani; S. Majid Mohseni; Ezio Iacocca; Yevgen Pogoryelov; Pranaba K. Muduli; Sunjae Chung; Philipp Dürrenfeld; Johan Åkerman

doi:10.1109/TMAG.2014.2305762

Recent Advances in Nanocontact Spin-Torque Oscillators

Randy K. Dumas, Sohrab R. Sani, S. Majid Mohseni, Ezio Iacocca, Yevgen Pogoryelov, Pranaba K. Muduli, Sunjae Chung, Philipp Dürrenfeld, Johan Åkerman

Research output: Contribution to journal › Review article › peer-review

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Abstract

We present a comprehensive review of the most recent advances in nanocontact spin torque oscillators (NC-STOs). NC-STOs are highly tunable, with both applied magnetic field and dc, broadband microwave signal generators. As opposed to the nanopillar geometry, where the lateral cross section of the entire device has been confined to a typically <;100 nm diameter, in NC-STOs, it is only the current injection site that has been laterally confined on top of an extended magnetic film stack. Three distinct material combinations will be discussed: 1) a Co/Cu/NiFe pseudospin valve (PSV) where both the Co and NiFe have a dominant in-plane anisotropy; 2) a Co/Cu/[Co/Ni] 4 orthogonal PSV where the Co/Ni multilayer has a strong perpendicular anisotropy; and 3) a single NiFe layer with asymmetric non-magnetic Cu leads. We explore the rich and diverse magnetodynamic modes that can be generated in these three distinct sample geometries.

Original language	English
Article number	4100107
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	6
Early online date	12 Jun 2014
DOIs	https://doi.org/10.1109/TMAG.2014.2305762
Publication status	Published - Jun 2014
Externally published	Yes

Keywords

Magnetodynamics
spin waves (SWs)
spin-torque oscillator (STO)
spin-transfer torque (STT)

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10.1109/TMAG.2014.2305762

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title = "Recent Advances in Nanocontact Spin-Torque Oscillators",

abstract = "We present a comprehensive review of the most recent advances in nanocontact spin torque oscillators (NC-STOs). NC-STOs are highly tunable, with both applied magnetic field and dc, broadband microwave signal generators. As opposed to the nanopillar geometry, where the lateral cross section of the entire device has been confined to a typically <;100 nm diameter, in NC-STOs, it is only the current injection site that has been laterally confined on top of an extended magnetic film stack. Three distinct material combinations will be discussed: 1) a Co/Cu/NiFe pseudospin valve (PSV) where both the Co and NiFe have a dominant in-plane anisotropy; 2) a Co/Cu/[Co/Ni] 4 orthogonal PSV where the Co/Ni multilayer has a strong perpendicular anisotropy; and 3) a single NiFe layer with asymmetric non-magnetic Cu leads. We explore the rich and diverse magnetodynamic modes that can be generated in these three distinct sample geometries.",

keywords = "Magnetodynamics, spin waves (SWs), spin-torque oscillator (STO), spin-transfer torque (STT)",

author = "Dumas, {Randy K.} and Sani, {Sohrab R.} and Mohseni, {S. Majid} and Ezio Iacocca and Yevgen Pogoryelov and Muduli, {Pranaba K.} and Sunjae Chung and Philipp D{\"u}rrenfeld and Johan {\AA}kerman",

year = "2014",

month = jun,

doi = "10.1109/TMAG.2014.2305762",

language = "English",

volume = "50",

journal = "IEEE Transactions on Magnetics",

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T1 - Recent Advances in Nanocontact Spin-Torque Oscillators

AU - Dumas, Randy K.

AU - Sani, Sohrab R.

AU - Mohseni, S. Majid

AU - Iacocca, Ezio

AU - Pogoryelov, Yevgen

AU - Muduli, Pranaba K.

AU - Chung, Sunjae

AU - Dürrenfeld, Philipp

AU - Åkerman, Johan

PY - 2014/6

Y1 - 2014/6

N2 - We present a comprehensive review of the most recent advances in nanocontact spin torque oscillators (NC-STOs). NC-STOs are highly tunable, with both applied magnetic field and dc, broadband microwave signal generators. As opposed to the nanopillar geometry, where the lateral cross section of the entire device has been confined to a typically <;100 nm diameter, in NC-STOs, it is only the current injection site that has been laterally confined on top of an extended magnetic film stack. Three distinct material combinations will be discussed: 1) a Co/Cu/NiFe pseudospin valve (PSV) where both the Co and NiFe have a dominant in-plane anisotropy; 2) a Co/Cu/[Co/Ni] 4 orthogonal PSV where the Co/Ni multilayer has a strong perpendicular anisotropy; and 3) a single NiFe layer with asymmetric non-magnetic Cu leads. We explore the rich and diverse magnetodynamic modes that can be generated in these three distinct sample geometries.

AB - We present a comprehensive review of the most recent advances in nanocontact spin torque oscillators (NC-STOs). NC-STOs are highly tunable, with both applied magnetic field and dc, broadband microwave signal generators. As opposed to the nanopillar geometry, where the lateral cross section of the entire device has been confined to a typically <;100 nm diameter, in NC-STOs, it is only the current injection site that has been laterally confined on top of an extended magnetic film stack. Three distinct material combinations will be discussed: 1) a Co/Cu/NiFe pseudospin valve (PSV) where both the Co and NiFe have a dominant in-plane anisotropy; 2) a Co/Cu/[Co/Ni] 4 orthogonal PSV where the Co/Ni multilayer has a strong perpendicular anisotropy; and 3) a single NiFe layer with asymmetric non-magnetic Cu leads. We explore the rich and diverse magnetodynamic modes that can be generated in these three distinct sample geometries.

KW - Magnetodynamics

KW - spin waves (SWs)

KW - spin-torque oscillator (STO)

KW - spin-transfer torque (STT)

U2 - 10.1109/TMAG.2014.2305762

DO - 10.1109/TMAG.2014.2305762

M3 - Review article

SN - 0018-9464

VL - 50

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 6

M1 - 4100107

ER -

Recent Advances in Nanocontact Spin-Torque Oscillators

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Keywords

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