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DTSTART;TZID=Europe/Berlin:20240611T140000
DTEND;TZID=Europe/Berlin:20240611T150000
DTSTAMP:20260502T023853
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240611T160000
DTEND;TZID=Europe/Berlin:20240611T170000
DTSTAMP:20260502T023853
CREATED:20240605T123744Z
LAST-MODIFIED:20240610T133953Z
UID:2795-1718121600-1718125200@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Structure and magnetism of LMO/SMO superlattices Vasily Moshnyaga
DESCRIPTION:Structure and magnetism of LMO/SMO superlattices \nProf. Dr. Vasily MoshnyagaI. Physikalisches InstitutGeorg-August-Universität Göttingen \nHeterostructures of strongly correlated oxides\, like superlattices (SLs) of (LaMnO3)m/(SrMnO3)n ((LMO)m/(SMO)n)\, provide a rich platform for searching emergent phases at the interfaces as well as to design artificial electronically/chemically inhomogeneous materials to study the manifestations of electron-spin-lattice correlations in reduced dimensions. We studied the structure and magnetism of the LMO/SMO SLs prepared on SrTiO3(100) substrates by metalorganic aerosol deposition (MAD) technique. The role of interfacial charge transfer in the high-TC emergent ferromagnetism and the interrelations between the octahedral tilt/rotation angle\, controlled by LMO/SMO ratio\, and magnetic/thermal properties have been elucidated. Further on\, we have grown LMO/SMO SLs with gradual La/Sr compositional modulations on the scale 5-10 u.c. and studied their role in the development of high- and low-temperature magnetic phases. We propose a route to grow strongly correlated heterostructures with modulated electronic properties at the nanoscale. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-structure-and-magnetism-of-lmo-smo-superlattices-vasily-moshnyaga/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Sonderseminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240627T140000
DTEND;TZID=Europe/Berlin:20240627T150000
DTSTAMP:20260502T023853
CREATED:20240625T060720Z
LAST-MODIFIED:20240625T061917Z
UID:3342-1719496800-1719500400@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Ultrafast spin-orbitronics with terahertz electromagnetic pulses Tobias Kampfrath
DESCRIPTION:Ultrafast spin-orbitronics with terahertz electromagnetic pulses\nTobias Kampfrath\nFreie Universität Berlin and Fritz Haber Institute of the Max Planck Society\, Berlin \n  \nTo take advantage of the electron spin in future electronics\, spin angular momentum needs to be transported and detected. Electric fields and temperature gradients have been shown to efficiently drive spin transport at megahertz and gigahertz frequencies. However\, to probe the initial elementary steps that lead to the formation of spin currents\, we need to launch and measure transport on much faster\, i.e.\, femtosecond time scales. \nTo achieve this goal\, we apply optical femtosecond laser pulses to induce a spin voltage in a metallic ferromagnetic layer F [1]. The resulting spin current into an adjacent layer is measured by conversion into a charge current in a layer N and detection of the concomitantly emitted terahertz electromagnetic pulse [2]. Interesting applications such as terahertz spin-conductance spectroscopy [3] and the generation of ultrashort terahertz electromagnetic pulses emerge [4]. In all cases\, the emitted terahertz signal arises from regions close to the F/N interface\, thereby making spintronic terahertz emission very interface-sensitive [5] \nThis methodology can be transferred from the spin to the so far highly unexplored orbital angular momentum of electrons. We obtain new insights into orbitronic phenomena on their natural time scales\, for example\, time-domain signatures of giant propagation lengths of orbital currents in tungsten [6]. \nFinally\, one can implement a reciprocal experimental scheme and use intense terahertz electromagnetic pulses to drive electric currents and control magnetic order on ultrafast time scales through\, for example\, Néel spin-orbit torques [7]. \n  \nReferences[1] Rouzegar et al.\, Phys. Rev. B 106\, 144427 (2022)[2] Kampfrath et al.\, Nature Nanotech. 8\, 256 (2013)[3] Rouzegar et al.\, arXiv:2305.09074 (2023)[4] Seifert et al.\, Nature Photon. 10\, 483 (2016); Rouzegar et al.\, Phys. Rev. Appl. 19\, 034018 (2023)[5] Gueckstock et al.\, Advanced Materials 33\, 2006281 (2021)[6] Seifert et al.\, Nature Nanotech. 18\, 1132-1138 (2023)[7] Behovits et al.\, Nature Communications 14\, 6038 (2023) \n\n\n\n\n\n\nFigure: Schematic of optically driven spin-orbitronic emission of ultrabroadband terahertz electromagnetic pulses from a generic F|N thin-film stack. 𝑴 is the magnetization of layer F. \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-ultrafast-spin-orbitronics-with-terahertz-electromagnetic-pulses-tobias-kampfrath/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Sonderseminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240628T100000
DTEND;TZID=Europe/Berlin:20240628T110000
DTSTAMP:20260502T023853
CREATED:20240627T140038Z
LAST-MODIFIED:20240627T141259Z
UID:3372-1719568800-1719572400@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Optimization and Application for Cryogenic Magnetic Refrigeration Using Yb-based Intermetallic Compounds Yasuyuki Shimura
DESCRIPTION:Optimization and Application for Cryogenic Magnetic Refrigeration Using Yb-based Intermetallic Compounds\nProf. Dr. Yasuyuki Shimura\nHiroshima University\, Japan \n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-optimization-and-application-for-cryogenic-magnetic-refrigeration-using-yb-based-intermetallic-compounds-yasuyuki-shimura/
LOCATION:University of Augsburg\, Room 242-R
CATEGORIES:Sonderseminar
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