V. H. Crespi
Pennsylvania State University
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Featured researches published by V. H. Crespi.
Physical Review Letters | 2008
X. Ke; Jinglei Li; Cristiano Nisoli; Paul E. Lammert; W. McConville; R. F. Wang; V. H. Crespi; P. Schiffer
We study ac demagnetization in frustrated arrays of single-domain ferromagnetic islands, exhaustively resolving every (Ising-like) magnetic degree of freedom in the systems. Although the net moment of the arrays is brought near zero by a protocol with sufficiently small step size, the final magnetostatic energy of the demagnetized array continues to decrease for finer-stepped protocols and does not extrapolate to the ground-state energy. The resulting complex disordered magnetic state can be described by a maximum-entropy ensemble constrained to satisfy just nearest-neighbor correlations.
Physical Review B | 2010
Jinglei Li; X. Ke; Sulin Zhang; D. Garand; Cristiano Nisoli; Paul E. Lammert; V. H. Crespi; P. Schiffer
We study the impact of geometry on magnetostatically frustrated single-domain nanomagnet arrays. We examine square and hexagonal lattice arrays, as well as a brickwork geometry that combines the anisotropy of the square lattice and the topology of the hexagonal lattice. We find that the more highly frustrated hexagonal lattice allows for the most thorough minimization of the magnetostatic energy, and that the pairwise correlations between moments differ qualitatively between hexagonal and brickwork lattices, although they share the same lattice topology. The results indicate that the symmetry of local interaction is more important than overall lattice topology in the accommodation of frustrated interactions.
Physical Review Letters | 2003
J. E. Han; O. Gunnarsson; V. H. Crespi
Physical Review B | 2000
Silvina M. Gatica; Milton W. Cole; George Stan; Jacob M. Hartman; V. H. Crespi
Physica Status Solidi B-basic Solid State Physics | 2005
O. Rösch; J. E. Han; O. Gunnarsson; V. H. Crespi
Bulletin of the American Physical Society | 2014
Robert Fraleigh; Paul E. Lammert; V. H. Crespi; Nitin Samarth; Ian Gilbert; P. Schiffer
Bulletin of the American Physical Society | 2014
David Rench; B.L. Le; Paul E. Lammert; Rajiv Misra; V. H. Crespi; Nitin Samarth; P. Schiffer
Bulletin of the American Physical Society | 2012
Oleg Shklyaev; Eric Mockensturm; V. H. Crespi
Bulletin of the American Physical Society | 2012
Yu Pan; K.K. Kohli; Robert Fraleigh; Andrew Balk; D. Finkel; Sulin Zhang; J. Li; Ian Gilbert; Paul E. Lammert; Rajiv Misra; V. H. Crespi; P. Schiffer; Nitin Samarth; Michael J. Erickson; Chris Leighton
Bulletin of the American Physical Society | 2011
K.K. Kohli; Andrew Balk; J. Li; Sulin Zhang; Paul E. Lammert; V. H. Crespi; P. Schiffer; Nitin Samarth