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DTSTART;TZID=Europe/Berlin:20240611T140000
DTEND;TZID=Europe/Berlin:20240611T150000
DTSTAMP:20240610T133420Z
CREATED:20240610T115811Z
LAST-MODIFIED:20240610T133420Z
UID:2801-1718114400-1718118000@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Microwave spectrum analyzer based on a rapidly tuned spin-torque nano-oscillator Andrei Slavin
DESCRIPTION:Microwave spectrum analyzer based on a rapidly tuned spin-torque nano-oscillator \nAndrei Slavin \nDepartment of Physics\, Oakland University\, Rochester\, MI 48309\, USA \nA spintronic method of ultra-fast broadband microwave spectrum analysis is proposed. It uses a rapidly tuned spin torque nano-oscillator (STNO) and does not require injection locking. This method treats an STNO generating a microwave signal as an element with an oscillating resistance. When an external signal is applied to this “resistor” for analysis\, it is mixed with the signal generated by the STNO. The resulting mixed voltage contains the “sum” and “difference” frequencies\, and the latter produces a DC component when the external frequency matches the frequency generated by the STNO.  The mixed voltage is processed using a low pass filter to exclude the “sum” frequency components and a matched filter to exclude the dependence of the resultant DC voltage on the phase difference between the two signals. It is found analytically and by numerical simulation that the proposed spectrum analyzer has a frequency resolution at a theoretical limit in a real-time scanning bandwidth of 10 GHz and a frequency scanning rate about 20 MHz /ns\, while remaining sensitive to signal power as low as the Johnson-Nyquist thermal noise floor. \n    \n Andrei Slavin received PhD degree in Physics in 1977 from the St.Petersburg Technical University\, St. Petersburg\, Russia.  Dr. Slavin developed a state-of-the-art theory of spin-torque oscillators\, which has numerous applications in the theory of current-driven magnetization dynamics in magnetic nanostructures. His current research support includes multiple grants from the U.S. Army\, DARPA\, SRC and the National Science Foundation. This research involves international collaborations with leading scientists in many countries\, including Germany\, Ukraine\, France\, Italy\, and the United States. Dr. Slavin is a frequently invited speaker at magnetism conferences around the world.  \n   Andrei Slavin is Fellow of the American Physical Society\, Fellow of the IEEE\, and Distinguished Professor  and Chair of the Physics Department at the Oakland University\, Rochester\, Michigan\, USA. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-microwave-spectrum-analyzer-based-on-a-rapidly-tuned-spin-torque-nano-oscillator-andrei-slavin/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Sonderseminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240311T113000
DTEND;TZID=Europe/Berlin:20240311T123000
DTSTAMP:20240507T214038Z
CREATED:20240209T140608Z
LAST-MODIFIED:20240507T214038Z
UID:1274-1710156600-1710160200@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Magnetic field versus temperature phase diagram of an effective spin-1/2 zigzag chain in a magnetic semiconductor YbCuS2 Takahiro Onimaru
DESCRIPTION:Magnetic field versus temperature phase diagram of an effective spin-1/2 zigzag chain in a magnetic semiconductor YbCuS2 \nProf. Dr. Takahiro Onimaru\nGraduate School of Advanced Science and Engineering\, Hiroshima University\, Japan \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr360-sonderseminar-magnetic-field-versus-temperature-phase-diagram-of-an-effective-spin-1-2-zigzag-chain-in-a-magnetic-semiconductor-ybcus2-takahiro-onimaru-2/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Sonderseminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20231108T170000
DTEND;TZID=Europe/Berlin:20231108T180000
DTSTAMP:20240507T214924Z
CREATED:20240209T113946Z
LAST-MODIFIED:20240507T214924Z
UID:1246-1699462800-1699466400@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: The unusual electron transport in metallic Kagome nets Philip J. W. Moll
DESCRIPTION:The unusual electron transport in metallic Kagome nets \nProf. Dr. Philip J. W. Moll \nMax Planck Institute for the Structure and Dynamics of Matter \n  \nMaterials that can host different states of electronic order form a recurring theme in physics and \nmaterials science\, and they are of particular interest if they are coupled strongly. A famous \nexample are ferroelectrics\, in which electric polarization and magnetism not only coexist but are \nstrongly linked. This both unveils a rich physics of correlated states\, and also opens unexpected \napplication avenues as the coupling promises to manipulate one state by a stimulus that primarily \nacts on another – say switching magnetism using electric fields. \nRecently\, materials based on the structural motif of the Kagome web have attracted significant \nattention for their tendency to host such strongly coupled phases. In particular\, the centro- \nsymmetric layered Kagome metal (K\,Cs)V3Sb5 have entered the focus of experimental and \ntheoretical research. They host a charge-density-wave type transition at elevated temperatures \n~100K\, followed by a superconducting transition at 3K (exact values depend on composition). \nYet there is another type of electronic order which thus far eludes exact microscopic \nidentification. A series of experimental probes detects the onset of anomalous behavior around \nT’~30-40K\, including thermal Hall\, µSR\, NMR\, magnetic torque\, Kerr rotation. The anomalous \nlow-temperature state carries the characteristics of a chiral\, nematic and time-reversal-symmetry \nbreaking fluid (all of which are under most active debate currently). \nYet what crystallizes out of the current state of experimental data is a highly entangled system \nwhich is extraordinarily responsive to external perturbations. This materials main strength is \nequally its weakness\, the unusual degree of coupling between states can hinder its systematic \ninvestigation. However\, it is already clear that it provides a platform to explore strongly coupled \ncorrelated phases\, and as a result it displays a thus-far unknown electromagnetic response\, a \ndiode in which the forward direction can be switched by the application of a magnetic field. I \nwill review the current state of the field\, and discuss ongoing projects in my department. \n  \n[1] C. Guo et al.\, Nature 611\, 461-466 (2022) \n[2] X. Huang et al.\, PRB 106\, 064510 (2022) \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr360-sonderseminar-magnetic-field-versus-temperature-phase-diagram-of-an-effective-spin-1-2-zigzag-chain-in-a-magnetic-semiconductor-ybcus2-takahiro-onimaru/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Sonderseminar
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