Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

Seyed Majid Mohseni; Sohrab R. Sani; Randy K. Dumas; Johan Persson; T. N. Anh Nguyen; Sunjae Chung; Ye. Pogoryelov; Pranaba K. Muduli; Ezio Iacocca; Anders Eklund; Johan Akerman

doi:10.1016/j.physb.2013.10.023

Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

Seyed Majid Mohseni, Sohrab R. Sani, Randy K. Dumas, Johan Persson, T. N. Anh Nguyen, Sunjae Chung, Ye. Pogoryelov, Pranaba K. Muduli, Ezio Iacocca, Anders Eklund, Johan Akerman

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Abstract

We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spin wave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response.

Original language	English
Pages (from-to)	84-87
Journal	Physica B: Condensed Matter
Volume	435
DOIs	https://doi.org/10.1016/j.physb.2013.10.023
Publication status	Published - 15 Feb 2014
Externally published	Yes

Keywords

Magnetic droplet soliton
Spin torque oscillators
Perpendicular magnetic anisotropy
Spin wave
Magnetoresistance

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10.1016/j.physb.2013.10.023

ManuscriptAccepted author manuscript, 605 KBLicence: CC BY-NC-ND

Cite this

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title = "Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators",

abstract = "We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spin wave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response.",

keywords = "Magnetic droplet soliton, Spin torque oscillators, Perpendicular magnetic anisotropy, Spin wave, Magnetoresistance",

author = "Mohseni, {Seyed Majid} and Sani, {Sohrab R.} and Dumas, {Randy K.} and Johan Persson and {Anh Nguyen}, {T. N.} and Sunjae Chung and Ye. Pogoryelov and Muduli, {Pranaba K.} and Ezio Iacocca and Anders Eklund and Johan Akerman",

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day = "15",

doi = "10.1016/j.physb.2013.10.023",

language = "English",

volume = "435",

pages = "84--87",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

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TY - JOUR

T1 - Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

AU - Mohseni, Seyed Majid

AU - Sani, Sohrab R.

AU - Dumas, Randy K.

AU - Persson, Johan

AU - Anh Nguyen, T. N.

AU - Chung, Sunjae

AU - Pogoryelov, Ye.

AU - Muduli, Pranaba K.

AU - Iacocca, Ezio

AU - Eklund, Anders

AU - Akerman, Johan

PY - 2014/2/15

Y1 - 2014/2/15

N2 - We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spin wave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response.

AB - We study microwave signal generation as a function of drive current and applied perpendicular magnetic field in nano-contact spin torque oscillators (NC-STOs) based on orthogonal (pseudo) spin valves where the Co fixed layer has strong easy-plane anisotropy, and the [Co/Ni] free layer has a strong perpendicular magnetic anisotropy. The orthogonal NC-STOs exhibit a dramatic transition from the conventional ferromagnetic resonance-like spin wave mode to a magnetic droplet soliton mode. In particular, the field and current dependence of the droplet soliton near threshold are discussed. Near threshold the droplet soliton undergoes complex dynamics that include mode hopping, as evident in the experimental frequency domain and magnetoresistance response.

KW - Magnetic droplet soliton

KW - Spin torque oscillators

KW - Perpendicular magnetic anisotropy

KW - Spin wave

KW - Magnetoresistance

U2 - 10.1016/j.physb.2013.10.023

DO - 10.1016/j.physb.2013.10.023

M3 - Article

SN - 0921-4526

VL - 435

SP - 84

EP - 87

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

Magnetic droplet solitons in orthogonal nano-contact spin torque oscillators

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Keywords

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