Advanced, Kerr-microscopy-based MOKE magnetometry for the anisotropy characterisation of magnetic films

Soldatov, Ivan; Zehner, Jonas; Leistner, K.; Kang, Tong; Karnaushenko, D.; Schäfer, Rudolf

doi:10.1016/j.jmmm.2021.167889

Cited by 18 publications

(12 citation statements)

References 32 publications

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“…The curves display little noise and no substantial hysteresis. The minor deviation between the outputs of the planar and rolled-up sensor originates most likely from the additional strain, which influences the magnetic properties of NiFe through magnetomechanical interactions ( 66 ). The integrated AMR sensor was optimized to offer high sensitivity for very small magnetic fields.…”

Section: Resultsmentioning

confidence: 99%

Electronically integrated microcatheters based on self-assembling polymer films

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Electronically integrated microcatheters based on self-assembling polymer films

et al. 2021

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“…MOKE hysteresis loops and domain images were captured in a Zeiss wide-field polarization microscope with a combined optical path. The entire system was equipped with an in-plane standard electromagnet and light source suitable for selective sensitivity in Kerr microscopy [ 61 , 62 ].…”

Section: Methodsmentioning

confidence: 99%

Operational Parameters for Sub-Nano Tesla Field Resolution of PHMR Sensors in Harsh Environments

Jeon

Das

Kim

et al. 2021

Sensors

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The resolution of planar-Hall magnetoresistive (PHMR) sensors was investigated in the frequency range from 0.5 Hz to 200 Hz in terms of its sensitivity, average noise level, and detectivity. Analysis of the sensor sensitivity and voltage noise response was performed by varying operational parameters such as sensor geometrical architectures, sensor configurations, sensing currents, and temperature. All the measurements of PHMR sensors were carried out under both constant current (CC) and constant voltage (CV) modes. In the present study, Barkhausen noise was revealed in 1/f noise component and found less significant in the PHMR sensor configuration. Under measured noise spectral density at optimized conditions, the best magnetic field detectivity was achieved better than 550 pT/√Hz at 100 Hz and close to 1.1 nT/√Hz at 10 Hz for a tri-layer multi-ring PHMR sensor in an unshielded environment. Furthermore, the promising feasibility and possible routes for further improvement of the sensor resolution are discussed.

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“…In Ref. [41] we have thoroughly investigated this effect, proving that it is caused by an intensity modulation of the reflected light due to the transverse Kerr effect, which is superimposed on the longitudinal rotation effect that primarily determines the contrast. As explained in Fig.…”

Section: Conventional Longitudinal Kerr Microscopymentioning

confidence: 99%

“…[27]) may be dangerous. It is furthermore worth to be noticed that the curve distortions can be strongly reduced 41 by running the microscope in the pure longitudinal mode 35 To guide the eye, cos ϕ, − sin ϕ, and cos 2ϕ functions have been added as they are expected to be measured under "ideal" conditions. The contrast is normalised to C long max , i.e.…”

Section: Conventional Longitudinal Kerr Microscopymentioning

confidence: 99%

Analyzer-free, intensity-based, wide-field magneto-optical microscopy

Schäfer

Oppeneer

Ognev

et al. 2021

Applied Physics Reviews

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In conventional Kerr-and Faraday microscopy the sample is illuminated with plane-polarised light and a magnetic domain contrast is generated by an analyser making use of the Kerr-or Faraday rotation. In this paper we demonstrate possibilities of analyser-free magneto-optical microscopy based on magnetisationdependent intensity modulations of the light: (i) The transverse Kerr effect can be applied for in-plane magnetised material, demonstrated for an FeSi sheet. (ii) Illuminating the same sample with circularly polarised light leads to a domain contrast with a different symmetry as the conventional Kerr contrast. (iii) Circular polarisation can also be used for perpendicularly magnetised material, demonstrated for a garnet film and an ultrathin CoFeB film. (iv) Plane-polarised light at a specific angle can be employed for both, in-plane and perpendicular media. (v) Perpendicular light incidence leads to a domain contrast on in-plane materials that is quadratic in the magnetisation and to a domain boundary contrast. (vi) Domain contrast can even be obtained without polariser. In cases (ii) and (iii), the contrasts are generated by MCD (Magnetic Circular Dichroism), i.e. by the differential absorption of left and right circularly polarised light, induced by magnetization components along the direction of light propagation. In case (v) the contrast is caused by MLD (Magnetic Linear Dichroism), i.e. by the differential absorption of linearly polarised light, induced by magnetisation components transverse to the propagation direction. The domain boundary contrast is due to the magneto-optical gradient effect. An explanation of these contrast phenomena is provided in terms of Maxwell-Fresnel theory.

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Advanced, Kerr-microscopy-based MOKE magnetometry for the anisotropy characterisation of magnetic films

Cited by 18 publications

References 32 publications

Electronically integrated microcatheters based on self-assembling polymer films

Electronically integrated microcatheters based on self-assembling polymer films

Operational Parameters for Sub-Nano Tesla Field Resolution of PHMR Sensors in Harsh Environments

Analyzer-free, intensity-based, wide-field magneto-optical microscopy

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