Publications by authors named "Konrad Bussmann"
Article Synopsis
- - Magnetoelectric (ME) magnetometers are gaining popularity due to their ultra-low-power consumption and compact size, with a detection capability in the picotesla range, suitable for monitoring magnetic signatures continuously.
- - Most current ME magnetic sensors utilize a resonant microelectromechanical system (MEMS) and the study focuses on optimizing this configuration by creating a new fixed-fixed resonant beam structure using low-stress materials like piezoelectric aluminum nitride and a novel iron-cobalt-hafnium alloy.
- - The developed MEMS resonators demonstrate a significant sensitivity of 125 Hz/mT and improved resistance to vibration, with discussions on their detection limits, noise sources, and potential design guidelines for future sensors.
Article Synopsis
- * This study focuses on enhancing magnetoelectric coupling in multilayer heterostructures by applying multiple strain engineering techniques on piezoelectric crystals which led to record-high coupling coefficients.
- * The findings indicate that large magnetoelectric responses can be achieved through magnetization changes influenced by strain and suggest a pathway for more energy-efficient magnetoelectric technologies.
Solution-deposited nanoscale films of RuO ("nanoskins") are effective transparent conductors once calcined to 200 °C. Upon heating the nanoskins to higher temperature the nanoskins show increased transmission at 550 nm. Electronic microscopy and X-ray diffraction show that the changes in the optical spectrum are accompanied by the formation of rutile RuO nanoparticles.
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- The study explores how tuning magnetic and electric properties in magnetoelectric composite heterostructures can enhance applications like energy harvesting and magnetic field sensing.
- It presents a method to achieve significant reversible changes in magnetic anisotropy through electric field-induced strains in specially engineered magnetostrictive thin films.
- The findings demonstrate a 90° in-plane rotation of magnetic anisotropy using low electric fields, achieving the highest converse magnetoelectric coupling coefficient in the linear piezoelectric regime, which is stable over a wide temperature range.
Luminescent gold nanocrystals (AuNCs) are a recently-developed material with potential optic, electronic and biological applications. They also demonstrate energy transfer (ET) acceptor/sensitization properties which have been ascribed to Förster resonance energy transfer (FRET) and, to a lesser extent, nanosurface energy transfer (NSET). Here, we investigate AuNC acceptor interactions with three structurally/functionally-distinct donor classes including organic dyes, metal chelates and semiconductor quantum dots (QDs).
View Article and Find Full Text PDFTo understand the importance of the band gap to the magnetic ordering in magnetic semiconductors, we have studied the effect of particle size on the ferromagnetic Curie temperature in semiconducting EuS. We have synthesized capped approximately 20 nm EuS nanoparticles using a single-source precursor, [Eu(S(2)CN(i)()Bu(2))(3)Phen] decomposed in trioctylphosphine. The nanoparticles have been characterized by X-ray powder diffraction, TEM, and magnetic susceptibility measurements as a function of temperature and field.
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