667f05hw5sol - ELEG 667016; MSEG-667-016 - Solid State...

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ELEG 667–016; MSEG-667-016 - Solid State Nanoelectronics – Fall 2005 Solutions Homework #5 - due Tuesday, 17 October 2005, in class 1. The maximum demagnetization field in a Néel wall is –4 π M s , (in cgs units) and the maximum self-energy density is () ss 1 4M M 2 π . In a wall of thickness Na, where a is the lattice constant, the demagnetization contribution to the surface energy is 2 demag s 2MN a . σ≈ π This is a type of anisotropy energy. The total wall energy, exchange + demag, is 2 22 2 ws JS Na 2 M Na , σ≈π + π by use of ( σ w = σ ex + σ anis ). The minimum is at 2 22 2 2 12 2 23 s N0 J SN a 2Ma , o r 1 NJ S M a , 2 ∂σ = = −π + π    and is given by ( ) ( ) 34 8 2 MS 2 Ja 10 10 10 10 10erg cm , −−
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This note was uploaded on 12/14/2011 for the course ELEG 661 taught by Professor Staff during the Fall '08 term at University of Delaware.

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