Colin Jermain
Cornell University
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Publication
Featured researches published by Colin Jermain.
Physical Review B | 2017
Colin Jermain; Sriharsha V. Aradhya; Neal Reynolds; R. A. Buhrman; Jack Brangham; M. R. Page; P. C. Hammel; Fengyuan Yang; D. C. Ralph
We report measurements of the frequency and temperature dependence of ferromagnetic resonance (FMR) for a 15-nm-thick yttrium iron garnet (YIG) film grown by off-axis sputtering. Although the FMR linewidth is narrow at room temperature [corresponding to a damping coefficient
Review of Scientific Instruments | 2016
J. R. Kirtley; Lisa Maria Paulius; Aaron J. Rosenberg; Johanna C. Palmstrom; Connor M. Holland; Eric Spanton; Daniel Schiessl; Colin Jermain; Jonathan Gibbons; Y.-K.-K. Fung; M. E. Huber; D. C. Ralph; Mark B. Ketchen; Gerald W. Gibson; Kathryn A. Moler
\ensuremath{\alpha}=(9.0\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}]
Physical Review B | 2017
Neal Reynolds; Priyamvada Jadaun; John Heron; Colin Jermain; Jonathan Gibbons; Robyn Collette; R. A. Buhrman; Darrell G. Schlom; D. C. Ralph
, comparable to previous results for high-quality YIG films of similar thickness, the linewidth increases strongly at low temperatures, by a factor of almost 30. This increase cannot be explained as due to two-magnon scattering from defects at the sample interfaces. We point out that the increased low-temperature linewidth can be explained by impurity relaxation mechanisms that were elucidated 50 years ago in bulk YIG samples. High-purity starting materials and careful optimization of growth protocols to avoid nonstoichiometries should therefore be employed for making low-temperature thin-film YIG devices.
Journal of Magnetism and Magnetic Materials | 2016
Colin Jermain; Graham E. Rowlands; R. A. Buhrman; D. C. Ralph
Superconducting QUantum Interference Device (SQUID) microscopy has excellent magnetic field sensitivity, but suffers from modest spatial resolution when compared with other scanning probes. This spatial resolution is determined by both the size of the field sensitive area and the spacing between this area and the sample surface. In this paper we describe scanning SQUID susceptometers that achieve sub-micron spatial resolution while retaining a white noise floor flux sensitivity of ≈2μΦ0/Hz1/2. This high spatial resolution is accomplished by deep sub-micron feature sizes, well shielded pickup loops fabricated using a planarized process, and a deep etch step that minimizes the spacing between the sample surface and the SQUID pickup loop. We describe the design, modeling, fabrication, and testing of these sensors. Although sub-micron spatial resolution has been achieved previously in scanning SQUID sensors, our sensors not only achieve high spatial resolution but also have integrated modulation coils for flux feedback, integrated field coils for susceptibility measurements, and batch processing. They are therefore a generally applicable tool for imaging sample magnetization, currents, and susceptibilities with higher spatial resolution than previous susceptometers.
Applied Physics Letters | 2016
Colin Jermain; Hanjong Paik; Sriharsha V. Aradhya; R. A. Buhrman; Darrell G. Schlom; D. C. Ralph
We report an initial experimental survey of spin-Hall torques generated by the rare-earth metals Gd, Dy, Ho, and Lu, along with comparisons to first-principles calculations of their spin Hall conductivities. Using spin torque ferromagnetic resonance (ST-FMR) measurements and DC-biased ST-FMR, we estimate lower bounds for the spin-Hall torque ratio,
Superconductor Science and Technology | 2016
J. R. Kirtley; Lisa Maria Paulius; Aaron J. Rosenberg; Johanna C. Palmstrom; Daniel Schiessl; Colin Jermain; Jonathan Gibbons; Connor M. Holland; Y.-K.-K. Fung; M. E. Huber; Mark B. Ketchen; D. C. Ralph; Gerald W. Gibson; Kathryn A. Moler
\xi_{SH}
Applied Physics Letters | 2018
Minh-Hai Nguyen; Shengjie Shi; Graham E. Rowlands; Sriharsha V. Aradhya; Colin Jermain; D. C. Ralph; R. A. Buhrman
, of
Physical review applied | 2017
Jason M. Bartell; Colin Jermain; Sriharsha V. Aradhya; Jack Brangham; Fengyuan Yang; D. C. Ralph; Gregory D. Fuchs
\approx
Bulletin of the American Physical Society | 2018
Jason M. Bartell; Jonathan Karsch; Colin Jermain; Jack Brangham; Fengyuan Yang; D. C. Ralph; Gregory D. Fuchs
0.04 for Gd,
Bulletin of the American Physical Society | 2017
Colin Jermain; Sriharsha V. Aradhya; Hanjong Paik; Jack Brangham; Michael R. Page; Neal Reynolds; Chris Hammel; Fengyuan Yang; Darrell G. Schlom; R. A. Buhrman; D. C. Ralph
\approx