Broadband ferromagnetic resonance characterization of GaMnAs thin films

Hamida, A. Ben; Sievers, S.; Pierz, K.; Schumacher, H. W.

doi:10.1063/1.4823740

Cited by 9 publications

(5 citation statements)

References 28 publications

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“…The sample was placed upside down on a coplanar waveguide (CPW) that was contacted with high frequency probes (GBB Picoprobe Model 40A) and connected to a Vector Network Analyzer (VNA, Rohde & Schwarz ZVA24). A magnetic field with constant amplitude of 100 mT was generated by a yoke that was rotated in the plane around the MOIF to perform φ-scans at frequencies up to 10 GHz [20]. The VNA detected transmission parameter S 21 is monitored for absorption analysis.…”

Section: Determination Of Anisotropy Constantsmentioning

confidence: 99%

Inhomogeneous field calibration of a magneto-optical indicator film device

Gerken

Sievers

Schumacher

2020

Meas. Sci. Technol.

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A concept for the traceable calibration of magneto-optical indicator film (MOIF) based magnetic field imaging devices is presented and discussed for the example of a commercial MOIF device with a 60 × 45 mm2 sensor. The calibration facilitates a quantitative and fast characterization of magnetic microstructures combining relatively high spatial resolution with large imaging areas. The macroscopic calibration is performed using the homogeneous magnetic stray field of a pre-characterized electromagnet with a large pole shoe diameter of 250 mm. However, this calibration alone cannot yet account for the vectorial and spatially fast decaying stray fields of magnetic microstructures. For that, a forward simulation approach is pursued, based on the temperature-dependent magnetic parameters of the MOIF material as resulting from superconducting quantum interference device magnetometry and ferromagnetic resonance measurements. This is complemented by a transfer function-based approach to correct the impact of the sensor thickness and in-plane stray field components. The validity of the combined calibration and simulation approach is proven by means of a quantitative characterization of a magnetic scale. For the commercial MOIF device a 28.4 µm spatial resolution and 1.18 mT field resolution is achieved. The calibration is validated by a comparison to scanning Hall probe microscopy results. Furthermore, the uncertainty budget is discussed.

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Section: Determination Of Anisotropy Constantsmentioning

confidence: 99%

Inhomogeneous field calibration of a magneto-optical indicator film device

Gerken

Sievers

Schumacher

2020

Meas. Sci. Technol.

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“…From broadband-FMR (BB-FMR) measurements between 3 and 8.5 GHz, we record the FMR frequency, F FMR , as a function of the in-plane magnetic field amplitude (B ext ) 21 . By extrapolation of our experimental values (F FMR vs B ext ) using the Kittel formula 22 , we found a SAW-FMR resonance condition around 4 mT and 6 mT for Pt/Co on LiNbO 3 and Al 2 O 3 , respectively.…”

Section: Samples Characteristics and Experimental Setupmentioning

confidence: 99%

Nonsymmetric spin pumping in a multiferroic heterostructure

et al. 2020

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We present spin pumping experiments in Co/Pt bilayers grown on Al2O3(0001) and on ferroelectric Y-cut LiNbO3 substrates. Spin pumping is triggered by resonant ferromagnetic resonance induced by surface acoustic waves. We observe that spin pumping efficiency varies when both the magnetization vector and the acoustic wave vector are reversed in Pt/Co/LiNbO3. This phenomenon is not observed in Pt/Co/Al2O3. We propose that the in-plane electric polarization of LiNbO3 is at the origin of the observed phenomenon. These observations open up the perspective of an electric field control of spin pumping efficiency.

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“…Such VNA‐FMR has become a versatile tool for all electrical characterization of precessional dynamics of various metallic magnetic thin films and multilayers over the last years . Based on a LT VNA‐FMR setup recently also VNA‐FMR investigations of GaMnAs have been demonstrated .…”

Section: Broadband Ferromagnetic Resonancementioning

confidence: 99%

Magnetotransport and magnetization dynamics of GaMnAs thin films and magnetic tunnel junctions

Hamida

Sievers

Bergmann

et al. 2014

Physica Status Solidi (b)

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.We describe the comprehensive characterization of GaMnAs epitaxial thin films and magnetic tunnel junctions (MTJ) by complementary techniques ranging from high-resolution imaging to magnetometry, magnetotransport, time-resolved magneto-optics, and coplanar broadband ferromagnetic resonance (FMR). Magnetometry and magnetotransport on macroscopic samples allow deriving the saturation magnetization and quasi-static reversal fields. Perpendicular transport experiments on patterned MTJ pillars further reveal the tunneling magnetoresistance ratio. Additionally the precessional dynamics are characterized by time-resolved magneto-optics and broadband network analyzer FMR yielding the effective Gilbert damping and the sample anisotropies. The combination of the different techniques allows a comprehensive characterization of the key magnetostatic and dynamic material parameters of GaMnAs-based thin films and devices.

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Broadband ferromagnetic resonance characterization of GaMnAs thin films

Cited by 9 publications

References 28 publications

Inhomogeneous field calibration of a magneto-optical indicator film device

Inhomogeneous field calibration of a magneto-optical indicator film device

Nonsymmetric spin pumping in a multiferroic heterostructure

Magnetotransport and magnetization dynamics of GaMnAs thin films and magnetic tunnel junctions

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