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Search Publications by: Robert D. McMichael (Assoc)

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Displaying 26 - 50 of 314

Sequential Bayesian experiment design for adaptive Ramsey sequence measurements.

October 11, 2021
Author(s)
Robert D. McMichael, Sergey Dushenko, Sean Blakley
The Ramsey sequence is a canonical example of a quantum phase determination for a spin qubit, but when readout fidelity is low, as with NV centers, measurement efficiency can be increased by focusing measurement resources on the most productive settings

optbayesexpt: Sequential Bayesian Experiment Design for Adaptive Measurements

February 3, 2021
Author(s)
Robert McMichael, Sean M. Blakley, Sergey Dushenko
Optbayesexpt is a free, open-source python package that provides adaptive algorithms for efficient estimation/measurement of parameters in a model function. Parameter estimation is the type of measurement one would conventionally tackle with a sequence of

Comparison of measured and simulated spin-wave mode spectra of magnetic nanostructures

January 6, 2021
Author(s)
Hans Nembach, Robert McMichael, Michael Schneider, Justin Shaw, Thomas J. Silva
Motivated by the importance of magnetization dynamics in nanomagnets for the development and optimization of magnetic devices and sensors, we measured and modeled spin wave spectra in patterned elliptical nanomagnets. Ferromagnetic resonance spectra for

Scalable microresonators for room-temperature detection of electron spin resonance from dilute, sub-nanoliter volume solids

October 28, 2020
Author(s)

Nandita S. Abhyankar, Amit K. Agrawal, Pragya R. Shrestha, Russell A. Maier, Robert D. McMichael, Jason P. Campbell, Veronika A. Szalai

Microresonators used for spin detection in volume-limited samples suffer from poor quality factors, which adversely affect sensitivity and ease of coupling to the microwave source. Here we adapt a metamaterial design with toroidal moment to confine

Quasi-two-dimensional magnon identification in antiferromagnetic FePS3 via magneto-Raman spectroscopy

February 18, 2020
Author(s)
Amber D. McCreary, Jeffrey R. Simpson, Thuc T. Mai, Robert D. McMichael, Jason E. Douglas, Nicholas P. Butch, Cindi L. Dennis, Rolando Valdes Aguilar, Angela R. Hight Walker
Recently it was discovered that van der Waals-bonded magnets retain long range magnetic ordering even down to a monolayer thickness, opening many avenues in fundamental physics and potential applications of these fascinating materials. One example is FePS3

Optimal Bayesian Experimental Design

September 4, 2019
Author(s)
Robert D. McMichael
This manual describes an implementation of optimal Bayesian experimental design methods. These methods address routine measurements where data are fit to experimental models in order to obtain model parameters. The twin benefits of these methods are

Spin-torque excitation of perpendicular standing spin waves in coupled YIG/Co heterostructures

March 23, 2018
Author(s)
Stefan Klinger, Vivek P. Amin, Stephan Gepraegs, Kathrin Ganzhorn, Hannes Maier-Flaig, Matthias Althammer, Hans Huebl, Rudolf Gross, Robert McMichael, Mark D. Stiles, Sebastian Goennenwein, Mathias Weiler
We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance frequencies of the YIG

Spin-wave propagation in cubic anisotropy materials

June 30, 2017
Author(s)
Koji Sekiguchi, Seo-Won Lee, Hiroaki Sukegawa, Nana Sato, Se-Hyeok Oh, Robert McMichael, Kyung-Jin Lee
The information carrier of modern technologies is the electron charge whose transport inevitably generates Joule heating. Spin-wave, the collective precessional motion of electron spins, does not involve moving charges and thus alleviates Joule heating [1

Using Terahertz Waves to Identify the Presence of Goethite via Antiferromagnetic Resonance

April 24, 2017
Author(s)
Edward J. Garboczi, David F. Plusquellic, Robert D. McMichael, Virgil Provenzano, Paul E. Stutzman, Jack T. Surek, Shin G. Chou, Shuangzhen Wang
Virtually every corrosion detection method reports only the presence of a material phase denoting probable corrosion, not its spectral signature. A signature specific to the type of iron oxide corrosion would not only confirm the presence of corrosion but

Enhanced ferromagnetic resonance linewidth of the free layer in perpendicular magnetic tunnel junctions

March 3, 2017
Author(s)
Daniel B. Gopman, Cindi L. Dennis, Robert D. McMichael, Xiaojie Hao, Zihui Wang, Xiaobin Wang, Huadong Gan, Yuchen Zhou, Jian Zhang, Yiming Huai
We report the frequency dependence of the ferromagnetic resonance linewidth of the free layer in magnetic tunnel junctions with all perpendicular-to-the-plane magnetized layers. While the magnetic-fi eld-swept linewidth nominally shows a linear growth with