Low spin current-driven dynamic excitations and metastability in spin-valve nanocontacts with unpinned artificial antiferromagnet

M. Eggeling; T. Dimopoulos; T. Uhrmann; O. Bethge; R. Heer; V. Höink; H. Brückl

doi:10.1063/1.3537953

Low spin current-driven dynamic excitations and metastability in spin-valve nanocontacts with unpinned artificial antiferromagnet

M. Eggeling, T. Dimopoulos, T. Uhrmann, O. Bethge, R. Heer, V. Höink, H. Brückl

Research output: Contribution to journal › Article › peer-review

Abstract

This work investigates the spin-torque-related dynamics of nonuniform magnetic vortexlike states in spin-valve nanocontacts, employing an unpinned artificial antiferromagnet as polarizer and amorphous Co Fe B as free layer. Subgigahertz spectra are obtained for contacts of 150-200 nm in diameter. Low critical current density and reversibility of the dynamic spectra with respect to the current are obtained. The spectral power and linewidth depend on the in-plane magnetic field, assuming maximum, respectively minimum, values within the free layer's magnetization switching. For certain field and current windows metastable dynamic states are clearly demonstrated. © 2011 American Institute of Physics.

Original language	English
Journal	Applied Physics Letters
Volume	98
Issue number	4
DOIs	https://doi.org/10.1063/1.3537953
Publication status	Published - 2011
Externally published	Yes

Keywords

Antiferromagnets
Dynamic excitations
Dynamic spectrum
Dynamic state
Free layers
In-plane magnetic fields
Magnetization switching
Metastabilities
Nanocontacts
Nonuniform
Spectral power
Spin currents
Spin torque
Spin-valves
Antiferromagnetic materials
Magnetic fields
Spin dynamics

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Cite this

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title = "Low spin current-driven dynamic excitations and metastability in spin-valve nanocontacts with unpinned artificial antiferromagnet",

abstract = "This work investigates the spin-torque-related dynamics of nonuniform magnetic vortexlike states in spin-valve nanocontacts, employing an unpinned artificial antiferromagnet as polarizer and amorphous Co Fe B as free layer. Subgigahertz spectra are obtained for contacts of 150-200 nm in diameter. Low critical current density and reversibility of the dynamic spectra with respect to the current are obtained. The spectral power and linewidth depend on the in-plane magnetic field, assuming maximum, respectively minimum, values within the free layer's magnetization switching. For certain field and current windows metastable dynamic states are clearly demonstrated. {\textcopyright} 2011 American Institute of Physics.",

keywords = "Antiferromagnets, Dynamic excitations, Dynamic spectrum, Dynamic state, Free layers, In-plane magnetic fields, Magnetization switching, Metastabilities, Nanocontacts, Nonuniform, Spectral power, Spin currents, Spin torque, Spin-valves, Antiferromagnetic materials, Magnetic fields, Spin dynamics",

author = "M. Eggeling and T. Dimopoulos and T. Uhrmann and O. Bethge and R. Heer and V. H{\"o}ink and H. Br{\"u}ckl",

note = "cited By 4",

year = "2011",

doi = "10.1063/1.3537953",

language = "English",

volume = "98",

number = "4",

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TY - JOUR

T1 - Low spin current-driven dynamic excitations and metastability in spin-valve nanocontacts with unpinned artificial antiferromagnet

AU - Eggeling, M.

AU - Dimopoulos, T.

AU - Uhrmann, T.

AU - Bethge, O.

AU - Heer, R.

AU - Höink, V.

AU - Brückl, H.

N1 - cited By 4

PY - 2011

Y1 - 2011

N2 - This work investigates the spin-torque-related dynamics of nonuniform magnetic vortexlike states in spin-valve nanocontacts, employing an unpinned artificial antiferromagnet as polarizer and amorphous Co Fe B as free layer. Subgigahertz spectra are obtained for contacts of 150-200 nm in diameter. Low critical current density and reversibility of the dynamic spectra with respect to the current are obtained. The spectral power and linewidth depend on the in-plane magnetic field, assuming maximum, respectively minimum, values within the free layer's magnetization switching. For certain field and current windows metastable dynamic states are clearly demonstrated. © 2011 American Institute of Physics.

AB - This work investigates the spin-torque-related dynamics of nonuniform magnetic vortexlike states in spin-valve nanocontacts, employing an unpinned artificial antiferromagnet as polarizer and amorphous Co Fe B as free layer. Subgigahertz spectra are obtained for contacts of 150-200 nm in diameter. Low critical current density and reversibility of the dynamic spectra with respect to the current are obtained. The spectral power and linewidth depend on the in-plane magnetic field, assuming maximum, respectively minimum, values within the free layer's magnetization switching. For certain field and current windows metastable dynamic states are clearly demonstrated. © 2011 American Institute of Physics.

KW - Antiferromagnets

KW - Dynamic excitations

KW - Dynamic spectrum

KW - Dynamic state

KW - Free layers

KW - In-plane magnetic fields

KW - Magnetization switching

KW - Metastabilities

KW - Nanocontacts

KW - Nonuniform

KW - Spectral power

KW - Spin currents

KW - Spin torque

KW - Spin-valves

KW - Antiferromagnetic materials

KW - Magnetic fields

KW - Spin dynamics

U2 - 10.1063/1.3537953

DO - 10.1063/1.3537953

M3 - Article

SN - 0003-6951

VL - 98

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

ER -

Low spin current-driven dynamic excitations and metastability in spin-valve nanocontacts with unpinned artificial antiferromagnet

Abstract

Keywords

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