Kickoff meeting for ExCom. Tentative Agenda: Introductions Financial reporting for 2024- Bob PSD for 2025 Region 5 Congress and Student Competitions in in Wichita, Kansas, March 28-30. Process for approving sponsoring requests from members New Initiatives Others ( please send other agenda items.) Virtual: https://events.vtools.ieee.org/m/463516
In novel, beyond Von Neumann, computational approaches the use of magnons (or quanta of spin waves) is particularly promising due to the small intrinsic energies of individual magnons (μeV), the possibility of using phase, in addition to magnitude, as a state variable, and the possibility to control the magnon dispersion properties in a magnetic sample by varying the direction and magnitude of the bias magnetic field . However, the use of magnons in advanced and neuromorphic computing is severely limited by the existing linear methods of magnon excitation, which are based on current-driven inductive transducers which have poor energy efficiency due to Ohmic losses, and are unable to effectively excite ultra-short exchange-dominated magnons. Here we propose to use a resonator-like energy-efficient gate, based on the effect of voltage-controlled magnetic anisotropy (VCMA) , as a new type of antenna for parametric excitation and reception of exchange-dominated magnons of a submicron wavelength, having a well-defined phase. When a pumping voltage V of a microwave frequency is applied to a resonator-like VCMA gate, the parametric excitation of two short-wavelength counter-propagating half-pumping-frequency magnons and will occur The magnetic anisotropy under the gate will be changed, causing partial reflections of the excited magnons at the both gate boundaries. The excited magnons, then, will have a well-defined phase, that is determined by the phase of the pumping voltage and by the reflection properties of the VCMA resonator. The wavenumber of the excited magnons could be large, and unrelated to the gate size, as it is determined only by the pumping frequency, and the magnon dispersion law . The same resonator-like VCMA gate can also act as a receiver of propagating short-wavelength magnons that will create a standing wave under the gate with double the magnon frequency. This standing wave of the frequency will be detected using a parametric confluence process opposite to the parametric splitting process (1) used for the excitation of magnons at the input VCMA gate. Our calculations show that the reflection of the excited magnons at the gate boundaries reduces the excitation threshold up to two times (in the case of full reflection ). The calculated excitation threshold for the VCMA gate is presented in Fig. 1. In our calculations we used geometric parameters that are typical for VCMA experiment made on Fe/MgO heterostructures (see e.g. : thickness of the Fe waveguide , thickness of dielectric layer , waveguide width , and the length of the pumping gate . Our preliminary numerical calculation performed for the simplified model of a voltage-biased VCMA gate (see Fig. 1) have demonstrated that the proposed method of parametric excitation and reception of ultra-short-wavelength magnons is realistic, and can be implemented in experiment to generate phase-modulated magnon signals of sub-micron wavelength with high energy efficiency in the GHz and sub-THz frequency ranges. A. Mahmoud, F. Ciubotaru, F. Vanderveken, A. V. Chumak, S. Hamdioui, C. Adelmann, and S. Cotofana, "Introduction to spin wave computing," Journal of Applied Physics, vol. 128, no. 16, p. 161101, 2020. P. Khalili Amiri and K. L. Wang, "Voltage-controlled magnetic anisotropy in spintronic devices," SPIN, vol. 02, no. 03, p. 1240002, 2012. R. Tomasello, R. Verba, V. Lopez-Dominguez, F. Garesci, M. Carpentieri, M. Di Ventra, P. Khalili Amiri, and G. Finocchio, "Antiferromagnetic Parametric Resonance Driven by Voltage-Controlled Magnetic Anisotropy," Physical Review Applied, vol. 17, no. 3, p. 034004, 2022. Co-sponsored by: UCCS Speaker(s): Andrei Slavin Room: A204, Bldg: Osborne Center for Science and Engineering, 1420 Austin Bluffs Pkwy, Colorado Springs, Colorado, United States, 80918, Virtual: https://events.vtools.ieee.org/m/461172
Monthly meeting of EMB Chapter, jointly with LMAG, with a tour. Meal will be box lunch. Please note when you register if you prefer vegetarian box lunch. There is a $15.00 charge for each registrant. Guests and non-members charge is $20.00 and Students are $5.00. Remainder of the tab will be picked up by the EMB. Speaker(s): Paul Morton, Agenda: 12:30pm: Welcome 12:45pm: Lunch 1:15pm: Tour 2::00pm: adjourn Advanced Diagnostic Laboratory, 1077 Central Pkwy S #200, San Antonio, Texas, United States, 78232
