Dual wavelength magneto-optical imaging of magnetic thin films

Hofe, Thomas von; Urs, Necdet Onur; Mozooni, Babak; Jansen, Thomas; Kirchhof, Christine; Bürgler, D. E.; Quandt, Eckhard; McCord, Jeffrey

doi:10.1063/1.4824426

Cited by 32 publications

(7 citation statements)

References 22 publications

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“…Magnetic domain observations techniques applied for the characterization of the piezomagnetic phase in ME heterostructures include magnetic force microscopy (MFM) [66], scanning electron microscopy with polarization analysis (SEMPA) [67], and soft X-ray magnetic circular dichroism–photoemission electron microscopy (XMCD-PEEM) [68]. In particular, magnetic domain imaging by magneto-optical Kerr effect (MOKE) microscopy [69,70] offers direct access to the local magnetization behavior on the ME device level [66,71,72,73,74,75,76]. MOKE microscopy allows in situ and time-resolved characterization of the magnetic phase of ME heterostructures.…”

Section: Thin-film Characterization Techniquesmentioning

confidence: 99%

Mechanical-Resonance-Enhanced Thin-Film Magnetoelectric Heterostructures for Magnetometers, Mechanical Antennas, Tunable RF Inductors, and Filters

Dong

Spetzler

et al. 2019

Materials

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The strong strain-mediated magnetoelectric (ME) coupling found in thin-film ME heterostructures has attracted an ever-increasing interest and enables realization of a great number of integrated multiferroic devices, such as magnetometers, mechanical antennas, RF tunable inductors and filters. This paper first reviews the thin-film characterization techniques for both piezoelectric and magnetostrictive thin films, which are crucial in determining the strength of the ME coupling. After that, the most recent progress on various integrated multiferroic devices based on thin-film ME heterostructures are presented. In particular, rapid development of thin-film ME magnetometers has been seen over the past few years. These ultra-sensitive magnetometers exhibit extremely low limit of detection (sub-pT/Hz1/2) for low-frequency AC magnetic fields, making them potential candidates for applications of medical diagnostics. Other devices reviewed in this paper include acoustically actuated nanomechanical ME antennas with miniaturized size by 1–2 orders compared to the conventional antenna; integrated RF tunable inductors with a wide operation frequency range; integrated RF tunable bandpass filter with dual H- and E-field tunability. All these integrated multiferroic devices are compact, lightweight, power-efficient, and potentially integrable with current complementary metal oxide semiconductor (CMOS) technology, showing great promise for applications in future biomedical, wireless communication, and reconfigurable electronic systems.

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Section: Thin-film Characterization Techniquesmentioning

confidence: 99%

Mechanical-Resonance-Enhanced Thin-Film Magnetoelectric Heterostructures for Magnetometers, Mechanical Antennas, Tunable RF Inductors, and Filters

Dong

Spetzler

et al. 2019

Materials

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“…A similar arrangement was recently published in Ref. [24], but based on 4 dichromatic LEDs. The ends of the glass fibers are imaged to the back-focal plane so that they can be seen in the conoscopic image similar to the slit aperture in a conventional setup (compare Figs.…”

Section: Conventional Wide-field Kerr Microscopymentioning

confidence: 87%

“…In Ref. [24] a similar multicomponent Kerr imaging was realized by using LEDs of two different colors along the vertical and horizontal branches of the cross (dichromatic imaging), resulting in two superimposed images with orthogonal sensitivities that can be separated by an image splitter between microscope and camera. The two complimentary domain images are then displayed in the same frame leading to a bisection and this reduction of the visible sample area.…”

Section: Conventional Wide-field Kerr Microscopymentioning

confidence: 99%

Selective sensitivity in Kerr microscopy

Soldatov

Schäfer

2017

Review of Scientific Instruments

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A new technique for contrast separation in wide-field magneto-optical Kerr microscopy is introduced. Utilizing the light from eight light emitting diodes, guided to the microscope by glass fibers and being switched synchronously with the camera exposure, domain images with orthogonal inplane sensitivity can be displayed simultaneously at real-time and images with pure in-plane or polar contrast can be obtained. The benefit of this new method of contrast separation is demonstrated for permalloy films, a NdFeB sinter magnet, and a cobalt crystal. Moreover, the new technique is shown to strongly enhance the sensitivity of Kerr microscopy by eliminating parasitic contrast contributions occurring in conventional setups. A doubling of the in-plane domain contrast and a sensitivity to Kerr rotations as low as 0.6 mdeg is demonstrated

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“…There are three main approaches for enhancing the contrast in Kerr microscopy. A first strategy rests on modifying the experimental setup to be sensitive to different magnetization components with a subsequent subtraction/addition of the signals at different magnetization states, [7,15] allowing for spatially resolved dynamics analysis [9,16] or vector imaging of magnetic domains. [6,7,17,18] In a second approach, the Kerr signal has been enhanced by covering the samples with antireflection layers [19,20] DOI: 10.1002/adpr.202300170 Magneto-optical Kerr microscopy is a powerful method for imaging magnetic domains.…”

Section: Introductionmentioning

confidence: 99%

Domain Imaging in Periodic Submicron Wide Nanostructures by Digital Drift Correction in Kerr Microscopy

Akhundzada,

Dingel,

Bischof

et al. 2023

Advanced Photonics Research

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Magneto‐optical Kerr microscopy is a powerful method for imaging magnetic domains. Even though domain imaging below the diffractive resolution limit is possible, such investigations are getting increasingly complex with decreasing structure size due to the decreasing Kerr contrast. As magnetic domain images free of topographical artifacts are obtained by subtracting a reference image from the actual image, the corresponding challenges are additionally increased by unavoidable sample motion in the time interval between acquiring the two images. Software‐based drift corrections typically rely on a unique structure in the image's region of interest (ROI), recognized automatically or selected manually by the user. By digital image shifting, the ROI positions in the actual and reference images are aligned, and the sample motion is compensated. For magnetic domain imaging in periodically arranged micro‐ or nano‐objects, unique topographical features are not given, making the drift correction by ROIs difficult, often even impossible. Herein, a novel software‐based approach is presented for drift corrections to image domains with features close/below the optical resolution limit and for investigating periodically arranged micro‐ or nano‐objects without utilizing ROIs. High‐contrast images are obtained, enabling the characterization of periodically arranged 1D, 2D, and 3D magnetic objects with lateral dimensions below 100 nm.

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Dual wavelength magneto-optical imaging of magnetic thin films

Cited by 32 publications

References 22 publications

Mechanical-Resonance-Enhanced Thin-Film Magnetoelectric Heterostructures for Magnetometers, Mechanical Antennas, Tunable RF Inductors, and Filters

Mechanical-Resonance-Enhanced Thin-Film Magnetoelectric Heterostructures for Magnetometers, Mechanical Antennas, Tunable RF Inductors, and Filters

Selective sensitivity in Kerr microscopy

Domain Imaging in Periodic Submicron Wide Nanostructures by Digital Drift Correction in Kerr Microscopy

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