Picosecond wide-field magneto-optical imaging of magnetization dynamics of amorphous film elements

Mozooni, Babak; Hofe, Thomas von; McCord, Jeffrey

doi:10.1103/physrevb.90.054410

Cited by 25 publications

(9 citation statements)

References 46 publications

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“…Because the ferromagnetic resonance frequency of FeCoSiB thin films is typically above 1 GHz rather low losses in the frequency range around 150 MHz would have been expected [ 72 , 73 ] assuming simple Landau-Lifshitz-Gilbert (LLG) resonance behavior [ 74 ]. Yet, for similar amorphous magnetic films [ 75 ] and FeCoSiB films of similar thicknesses [ 76 ], domain wall resonance effects in the lower 100 MHz regime have been reported and the losses were directly connected to magnetic domain wall resonances. Eddy-current effects should not play a role in the magnetic domain wall losses [ 77 ], only internal damping is of relevance.…”

Section: Phase Noise In Magnetic Operating Pointsmentioning

confidence: 99%

Phase Noise of SAW Delay Line Magnetic Field Sensors

Durdaut

Müller

Kittmann

et al. 2021

Sensors

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Surface acoustic wave (SAW) sensors for the detection of magnetic fields are currently being studied scientifically in many ways, especially since both their sensitivity as well as their detectivity could be significantly improved by the utilization of shear horizontal surface acoustic waves, i.e., Love waves, instead of Rayleigh waves. By now, low-frequency limits of detection (LOD) below 100 pT/Hz can be achieved. However, the LOD can only be further improved by gaining a deep understanding of the existing sensor-intrinsic noise sources and their impact on the sensor’s overall performance. This paper reports on a comprehensive study of the inherent noise of SAW delay line magnetic field sensors. In addition to the noise, however, the sensitivity is of importance, since both quantities are equally important for the LOD. Following the necessary explanations of the electrical and magnetic sensor properties, a further focus is on the losses within the sensor, since these are closely linked to the noise. The considered parameters are in particular the ambient magnetic bias field and the input power of the sensor. Depending on the sensor’s operating point, various noise mechanisms contribute to f0 white phase noise, f−1 flicker phase noise, and f−2 random walk of phase. Flicker phase noise due to magnetic hysteresis losses, i.e. random fluctuations of the magnetization, is usually dominant under typical operating conditions. Noise characteristics are related to the overall magnetic and magnetic domain behavior. Both calculations and measurements show that the LOD cannot be further improved by increasing the sensitivity. Instead, the losses occurring in the magnetic material need to be decreased.

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Section: Phase Noise In Magnetic Operating Pointsmentioning

confidence: 99%

Phase Noise of SAW Delay Line Magnetic Field Sensors

Durdaut

Müller

Kittmann

et al. 2021

Sensors

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“…Time-resolved implementations of established experimental techniques for mapping magnetic structures at sub-micrometer dimensions have been already accomplished for magneto-optical Kerr effect microscopy 16 , photoemission electron microscopy 17 , scanning electron microscopy with polarization analysis 18 , scanning transmission x-ray microscopy 3;19 , small-angle x-ray scattering 20 , and holography using x-rays 21 . Novel imaging approaches using circularly polarized high-harmonic radiation 22 may even provide access to magnetization dynamics on timescales of few femtoseconds.…”

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confidence: 99%

Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy

et al. 2018

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Novel time-resolved imaging techniques for the investigation of ultrafast nanoscale magnetization dynamics are indispensable for further developments in lightcontrolled magnetism. Here, we introduce femtosecond Lorentz microscopy, achieving a spatial resolution below 100 nm and a temporal resolution of 700 fs, which gives access to the transiently excited state of the spin system on femtosecond timescales and its subsequent relaxation dynamics. We demonstrate the capabilities of this technique by spatio-temporally mapping the light-induced demagnetization of a single magnetic vortex structure and quantitatively extracting the evolution of the magnetization field after optical excitation. Tunable electron imaging conditions allow for an optimization of spatial resolution or field sensitivity, enabling future investigations of ultrafast internal dynamics of magnetic topological defects on 10-nanometer length scales.Aiming for higher bit densities, manipulation of magnetization on the nanoscale is a key aspect for future information processing and storage applications. In recent years, significant achievements on controlling magnetic domains and topological defects †

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“…A very large average velocity of 600 m/s was detected for domain-wall motion in the NiFe layer by using XMCD-PEEM [90]. In particular, magnetic domain imaging by magneto-optical Kerr effect (MOKE) microscopy offers direct access to the behavior of local magnetization [91][92][93][94]. MOKE microscopy based on the Kerr and the Faraday effects is one of the most prominent techniques for observing magnetic domain Both the fundamental studies of magnetism and boosting of magnetic industry are greatly influenced by the imaging of magnetic microstructures.…”

Section: Characterization Methods Of Thin Filmsmentioning

confidence: 99%

“…MOKE microscopy based on the Kerr and the Faraday effects is one of the most prominent techniques for observing magnetic domain and is able to visualize the magnetic dynamics on fast time-scales. Allowing for the direct imaging under a continuous field excitation, a picosecond wide-field MOKE microscopy for imaging magnetization dynamics is demonstrated in [92]. An example of nanosecond domain wall displacements and spin-wave generation are observed and displayed in Figure 8 [93].…”

Section: Characterization Methods Of Thin Filmsmentioning

confidence: 99%

A Review of Thin-Film Magnetoelastic Materials for Magnetoelectric Applications

Liang

Dong

Chen

et al. 2020

Sensors

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Since the revival of multiferroic laminates with giant magnetoelectric (ME) coefficients, a variety of multifunctional ME devices, such as sensor, inductor, filter, antenna etc. have been developed. Magnetoelastic materials, which couple the magnetization and strain together, have recently attracted ever-increasing attention due to their key roles in ME applications. This review starts with a brief introduction to the early research efforts in the field of multiferroic materials and moves to the recent work on magnetoelectric coupling and their applications based on both bulk and thin-film materials. This is followed by sections summarizing historical works and solving the challenges specific to the fabrication and characterization of magnetoelastic materials with large magnetostriction constants. After presenting the magnetostrictive thin films and their static and dynamic properties, we review micro-electromechanical systems (MEMS) and bulk devices utilizing ME effect. Finally, some open questions and future application directions where the community could head for magnetoelastic materials will be discussed.

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Picosecond wide-field magneto-optical imaging of magnetization dynamics of amorphous film elements

Cited by 25 publications

References 46 publications

Phase Noise of SAW Delay Line Magnetic Field Sensors

Phase Noise of SAW Delay Line Magnetic Field Sensors

Nanoscale Mapping of Ultrafast Magnetization Dynamics with Femtosecond Lorentz Microscopy

A Review of Thin-Film Magnetoelastic Materials for Magnetoelectric Applications

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