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DTSTART;TZID=America/New_York:20190625T103000
DTEND;TZID=America/New_York:20190625T120000
DTSTAMP:20260410T043528
CREATED:20190610T205631Z
LAST-MODIFIED:20190610T205631Z
UID:10006233-1561458600-1561464000@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: “Thermalization of Bulk Magnetic Materials in Spin-Lattice Dynamics Simulations”
DESCRIPTION:Spin-lattice dynamics (SLD)\, an increasingly popular simulation method which simultaneously computes both atomic displacements and spins\, offer new possibilities for modeling the temporal evolution of systems where the coupling between these atomic features are relevant such as spin caloritronics\, heat assisted magnetic recording\, magnetocaloric responses and magnetic nanoparticle hyperthermia. To accurately model and understand these magnetic materials\, SLD must capture spin-spin and spin-lattice interactions in a physically meaningful way. Recent work indicates that including a local magnetic anisotropy term in SLD simulations may be necessary to appropriately couple the magnetic spins to the atomic system to allow for thermal transport between the systems. A key obstacle to the adoption of this term is the lack of knowledge of its parameters for a broad range of materials. Ab initio calculations can obtain these parameters\, but these calculations are limited by energy scales\, system size and computational cost. A new framework using bulk experimental properties is introduced to obtain these parameters which avoids some or all of these challenges of the ab initio method. Results from this framework are discussed for iron along with the validation procedure for the found parameters.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-thermalization-of-bulk-magnetic-materials-in-spin-lattice-dynamics-simulations/
LOCATION:Moore 216\, 200 S. 33rd Street\, Philadelphia\, PA\, 19104\, United States
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DTSTART;TZID=America/New_York:20190626T153000
DTEND;TZID=America/New_York:20190626T170000
DTSTAMP:20260410T043528
CREATED:20190624T193409Z
LAST-MODIFIED:20190624T193409Z
UID:10006234-1561563000-1561568400@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Effect of Nanoparticle Size on the Mechanical Properties of Nanoparticle (NP) Assemblies"
DESCRIPTION:Nanoparticle assemblies (NPAs) have attracted tremendous interests of various research communities. The particle-size-effect on mechanical properties of NPAs is systematically studied. With decreasing the particle size d from 300 nm to 10 nm\, the SiO2 NPAs become drastically harder (∼39×)\, stiffer (∼15×)\, and tougher (>3.5×). The results are consistent with the data scattered in the literature for various nanoparticle (NP) systems\, indicating a fundamentally universal d-effect for all NPAs. A model is developed to correlate the hardness and the NP junction (NPJ) strength f. Here\, f is mainly due to van der Waals and capillary interactions\, roughly a constant (140 nN) for d = 100–300 nm\, and then f decreases with decreasing d from ∼100 nm. The deformation mechanism of NPAs (for indentation depth ≫d) is shear plasticity involving shear breaking of NPJs. The fundamental mechanism for the d-effect is that\, with decreasing d\, the NPJ’s planar density increases much faster than the decrease of f. Moreover\, three deformation mechanisms of NPAs\, (1) nanoparticle dislodging\, (2) shear-band formation\, and (3) cracking are naturally d-dependent. These new findings can provide important insights into the fundamental understanding of the inter-NP interaction\, the mechanical behavior of the NPAs\, and the design of robust NP-based devices. If time allows\, as an independent topic\, the experimental characterization of freestanding membrane will also be briefly discussed.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-effect-of-nanoparticle-size-on-the-mechanical-properties-of-nanoparticle-np-assemblies/
LOCATION:Moore 212
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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