Ferromagnetic resonance phase imaging in spin Hall multilayers

Guo, Feng; Bartell, Jason; Fuchs, Gregory D.

doi:10.1103/physrevb.93.144415

Cited by 9 publications

(12 citation statements)

References 46 publications

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“…A microwave source is synchronized with a fast-pulsed light source, and the light measures or images the magnetization via a magneto-optical effect such as Kerr rotation or x-ray magnetic circular dichroism [22–32]. An interesting variation on the stroboscopic method is an electrical measurement of the Nernst voltage under microwave excitation and pulsed laser heating [33–35]. Previously, we reported a phase-sensitive, magneto-optical FMR detection method using a stroboscopic method with light modulated at the resonance frequency [36].…”

Section: Introductionmentioning

confidence: 99%

Phase-resolved ferromagnetic resonance using a heterodyne detection method

2016

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This paper describes a phase-resolved ferromagnetic resonance (FMR) measurement using a heterodyne method. Spin precession is driven by microwave fields and detected by 1550 nm laser light that is modulated at a frequency slightly shifted with respected to the FMR driving frequency. The evolving phase difference between the spin precession and the modulated light produces a slowly oscillating Kerr rotation signal with a phase equal to the precession phase plus a phase due to the path length difference between the excitation microwave signal and the optical signal. We estimate the accuracy of the precession phase measurement to be 0.1 rad. This heterodyne FMR detection method eliminates the need for field modulation and allows a stronger detection signal at higher intermediate frequency where the 1/f noise floor is reduced.

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Section: Introductionmentioning

confidence: 99%

Phase-resolved ferromagnetic resonance using a heterodyne detection method

2016

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“…For example, nanoscale phasesensitive imaging could be useful for understanding mechanisms and phase-relationships in mutual synchronization locking of spin-orbit torque oscillators [12]. Meanwhile, the capability to image current from DC to microwave frequencies could clarify the origins of magnetic resonances in spatially non-uniform spin-Hall nano-devices [37].…”

Section: Discussionmentioning

confidence: 99%

Nanoscale magnetization and current imaging using scanning-probe magneto-thermal microscopy

Zhang,

Bartell,

Karsch

et al. 2021

Preprint

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Magnetic microscopy that combines nanoscale spatial resolution with picosecond scale temporal resolution uniquely enables direct observation of the spatiotemporal magnetic phenomena that are relevant to future high-speed, high-density magnetic storage and logic technologies. Magnetic microscopes that combine these metrics has been limited to facility-level instruments. To address this gap in lab-accessible spatiotemporal imaging, we develop a time-resolved near-field magnetic microscope based on magneto-thermal interactions. We demonstrate both magnetization and current density imaging modalities, each with spatial resolution that far surpasses the optical diffraction limit. In addition, we study the near-field and time-resolved characteristics of our signal and find that our instrument possesses a spatial resolution on the scale of 100 nm and a temporal resolution below 100 ps. Our results demonstrate an accessible and comparatively low-cost approach to nanoscale spatiotemporal magnetic microscopy in a table-top form to aid the science and technology of dynamic magnetic devices with complex spin textures.

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“…Only recently, it has been noticed by spatially resolved ferromagnetic resonance phase imaging that a possible phase difference transverse to a CoFeB/Pt stripe exists 29 , and affects the determination the magnitude of hDL. Note that for the sample studied in Ref.…”

Section: Methodsmentioning

confidence: 99%

Dynamic detection of current-induced spin-orbit magnetic fields

et al. 2021

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Current induced spin-orbit torques (SOTs) in ferromagnet/non-magnetic metal heterostructures open vast possibilities to design spintronic devices to store, process and transmit information in a simple architecture. It is a central task to search for efficient SOT-devices, and to quantify the magnitude as well as the symmetry of current-induced spin-orbit magnetic fields (SOFs). Here, we report a novel approach to determine the SOFs based on magnetization dynamics by means of time-resolved magneto-optic Kerr microscopy. A microwave current in a narrow Fe/GaAs (001) stripe generates an Oersted field as well as SOFs due to the

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Ferromagnetic resonance phase imaging in spin Hall multilayers

Cited by 9 publications

References 46 publications

Phase-resolved ferromagnetic resonance using a heterodyne detection method

Phase-resolved ferromagnetic resonance using a heterodyne detection method

Nanoscale magnetization and current imaging using scanning-probe magneto-thermal microscopy

Dynamic detection of current-induced spin-orbit magnetic fields

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