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Anomalous heat transport and numeric...

Mai, Trieu Thanh.

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Anomalous heat transport and numerical studies of magnetic hysteresis.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Anomalous heat transport and numerical studies of magnetic hysteresis./
作者:	Mai, Trieu Thanh.
面頁冊數:	131 p.
附註:	Adviser: Onuttom Narayan.
Contained By:	Dissertation Abstracts International68-05B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3265728
ISBN:	9780549042709

Anomalous heat transport and numerical studies of magnetic hysteresis.
Mai, Trieu Thanh.

Anomalous heat transport and numerical studies of magnetic hysteresis. - 131 p.

Adviser: Onuttom Narayan.

Thesis (Ph.D.)--University of California, Santa Cruz, 2007.

When a small temperature gradient is applied across a system, in steady-state a heat current exists and is expected to follow Fourier's law. In certain low dimensional systems, Fourier's law breaks down and heat transport is anomalous. The anomalous heat conductiv ity n diverges with system size L as kappa &sim; Lgamma. By using hydrodynamic and renormalization group arguments, the nature of the divergence is found to be universal in one-dimensional systems with an exponent gamma = 1/3. The universality class contains all momentum-conserving one-dimensional systems, despite the existence of broken symmetries. Careful numerical simulations of anharmonic chains confirm this universality.

ISBN: 9780549042709Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Anomalous heat transport and numerical studies of magnetic hysteresis.
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100 1 $a Mai, Trieu Thanh. $3 1265633
245 1 0 $a Anomalous heat transport and numerical studies of magnetic hysteresis.
300 $a 131 p.
500 $a Adviser: Onuttom Narayan.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3114.
502 $a Thesis (Ph.D.)--University of California, Santa Cruz, 2007.
520 $a When a small temperature gradient is applied across a system, in steady-state a heat current exists and is expected to follow Fourier's law. In certain low dimensional systems, Fourier's law breaks down and heat transport is anomalous. The anomalous heat conductiv ity n diverges with system size L as kappa &sim; Lgamma. By using hydrodynamic and renormalization group arguments, the nature of the divergence is found to be universal in one-dimensional systems with an exponent gamma = 1/3. The universality class contains all momentum-conserving one-dimensional systems, despite the existence of broken symmetries. Careful numerical simulations of anharmonic chains confirm this universality.
520 $a The heat conduction analysis requires the existence of well-defined local thermodynamic fields, especially a local temperature. Numerical simulations of chains show that even slight deviations from the mono-atomic anharmonic chain, such as the addition of impurities, dramatically eliminate the possibility of a well-behaved local temperature for such systems. This discovery extends the seminal 1955 numerical experiment by Fermi, Pasta, and Ulam on the question of equipartition of energy to include heat baths in the nonequilibrium steady-state setting.
520 $a Magnetic hysteresis, another inherently nonequilibrium phenomenon, is also considered. Numerical simulations of magnetic nanopillar arrays reveal the possibility of hysteresis multicycles, where more than one cycle of the external field is required for a configuration to return to the same microscopic configuration. This realistic model and calculated parameters support the belief that disorder and frustration are needed for multicycles to exist. We also use extensive simulations to explain a surprising asymmetry of microscopic memory measurements by Pierce et al. (2005) on disordered Co/Pt magnetic thin films. A dynamical symmetry breaking mechanism from the Landau-Lifshitz-Gilbert spin evolution equation is discovered. In addition, we offer explanations for other experimental results, including: the effects of disorder, intriguing hysteresis loops, and magnetic pattern formation.
590 $a School code: 0036.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Theory. $3 1019422
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710 2 0 $a University of California, Santa Cruz. $3 1018764
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791 $a Ph.D.
792 $a 2007
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