Condensed-Matter Physics & Materials Science Seminar

"Natural, Artificial, and Stuffed Spin Ice"

Presented by Peter Schiffer, Penn State

Wednesday, October 3, 2007, 1:30 pm — Conference Room, Bldg. 480

Geometrical frustration among spins in magnetic materials can lead to
exotic low temperature states including "spin ice" in which the local
moments mimic the frustration of hydrogen ion positions in frozen water
including measurable "ground state entropy." We have performed
extensive studies of the spin ice materials, examining how the spins
freeze at low temperatures and how structural disorder affects the
magnetic zero point entropy. Additionally, we examine "artificial" spin
ice formed from lithographically fabricated regular arrays of
single-domain ferromagnetic islands arranged such that the dipolar
interactions are analogous to those in spin ice. Images of the magnetic
moments of individual elements in this correlated system allow us to
study the local accommodation of frustration. The results demonstrate
that artificial frustrated magnets can provide a rich new arena in which
to study the physics of

Hosted by: Meigan Aronson

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