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Trust me. QED

SIAM News

Heroux, Michael A.

Consider a standard SIAM journal article containing theoretical results. Each theorem has a proof that typically builds on previous developments. Since every theorem stems from a firm foundation, the research community can trust a result without further evidence. One could thus argue that a theorem does not require a proof because surely an author would not publish it if no proof existed to back it up. Furthermore, respectable reviewers and editors expect proofs without exception, and papers containing proof-less theorems will likely go unpublished.

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TYPE Journal Article YEAR 2019
OSTI

Creation of nanoscale magnetic fields using nano-magnet arrays

AIP Advances

Sapkota, Keshab R.; Eley, S.; Bussmann, Ezra; Harris, Charles T.; Maurer, Leon; Lu, T.M.

We present the fabrication of nano-magnet arrays, comprised of two sets of interleaving SmCo5 and Co nano-magnets, and the subsequent development and implementation of a protocol to program the array to create a one-dimensional rotating magnetic field. We designed the array based on the microstructural and magnetic properties of SmCo5 films annealed under different conditions, also presented here. Leveraging the extremely high contrast in coercivity between SmCo5 and Co, we applied a sequence of external magnetic fields to program the nano-magnet arrays into a configuration with alternating polarization, which based on simulations creates a rotating magnetic field in the vicinity of nano-magnets. Our proof-of-concept demonstration shows that complex, nanoscale magnetic fields can be synthesized through coercivity contrast of constituent magnetic materials and carefully designed sequences of programming magnetic fields.

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TYPE Journal Article YEAR 2019
DOIOSTIScopus
Results 24001–24200 of 101,000
Results 24001–24200 of 101,000
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