[Alabama-ORNL Collaboration: Adaptation of Fast Multipole Code for Atomic-scale Micromagnetics]. Final Report: DE-FG02-98ER45714 Page: 2 of 3
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Scientific Productivity
" 5 publications (I Phys. Rev. B, 4 J. Apple. Phys.)
" 15 conference presentations (1 invited)
* 2 extramural seminars
.4 proposals funded
* S proposals rejected
'1 proposal pendingAccomplishments
This project was directed at the study of dynamics of magnetization in
megnetiC systems, particularly nagnoiostatic interactions. knporant
reuts have been obtained in four areas:
" (1) development of new and efficient fast-multipole methods
for dealing with long range magnetostatic interactions
Moead ealdi, a poetdoc weithu f M'ema pqpop, made ascualivhe to Oat
oe' " wo"t w"It"o ""ea Smh" e n due "er"" a"'"" PM me"""" In the ORNL
rodc. Sewndipitnely, an opptWity to Iemage themesleds eves aM widely tie
appeased hi elmo of emapnetica tlmAt of DoEts Compoatlonzi Maedia Sfieace
?1btwsrk(CfSN), Prdby Dmee Hazmoa(Ames) and Malolmn Bloch (05ML). P.
Vis-cber, Dmnifi Apelke , sandXu*iMgFeeg(a gratt student at Aatsba) are
watingai Ongfr tnm (a poetde par taly a eppatedby CMS1 atOML) ned
Sebuhom(0RNL) to detop PMk iwmane lc condesibe geaeral CsN un. The
maim Aibama entba utothis wok i(a) he rimptfiadm ofFIM codas ad egh
tie. use oFrec asiae mad hhiertijeacemhdl, and (b)tfe davelopeact of implew
Caumimn (a, opposed to the sal .ptdca-harmouic) eapamima f r Tte FMK
Accomplishments (3)
" (3) progress in understanding how damping on
macroscopic scales arises from energy transfer to short-
wavelength spin waves
We qppfed mnemau inon-group methedi [Feng and Viseeber, J. App. Pim.,
v. 09.69", 201 (.r: - . , -... . ::. .: e calfntate the
depede1S, LondauiLhittdpigonalan ize asid sewua frm energy
kme to hort wawlaujth in wavsu nh ism impoetul effect, especiary at hue
veryhlgu uwitchigspcedafhest-envead[4mag-etc medah bemse brrieaic
mechanisum h eas upinliatfe is atienam ineeflecdiv om inad limes.
- (4) Quatenion algorithm for micromagnetics
k apaper accepted by Phy. Rev. B (Frng A Vicher, Phys. Rev. 11, 2002,
..9 :_ r.. ...:a: - -.. . - ey..-r.!] wehasde'eahped and kestd a
mEw a i1iaformicaaoaete eingataijon whictiFltaes vienliznae aetal
processed e fesefemoe flame oidie lcal megnetintioan. Insed ortbtewmig
the cehangee i the msladatinswetor M, t faawe ehage inhe salteuioe
(relatioamstih) wldiel deacnibea thepreceaiegleceal raneinwhichM I
crausaut.Accomplishments (2)
" (2) Direct evidence for the importance of interactions in
novel nanostnctured materials synthesized at ORNL
Ieiwalk (T C. Sho itbem eta, s. Apple. Physics, v. S9, 759 2001) involved
the aehauime of malesial .yneewcid by Lyen Boate'b Ureep Kt O1M sieg ion
iroptantadionof aa invtirtrilm-ta-ltled gamet. The ystreais cerwaa were
caculated witi amd without snapeenetatic hIusacdoeg, mnd h wafiond deal
meageiettado lataeebiom esmake this latae asrinolu ious h avery
high degeeferyet e at'etn) rc indthe behvier of an so pmateriaL
'Tth a emi lrsionaleahisNieracdons I, very impoMelfo he ecareet
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Visscher, P. B. [Alabama-ORNL Collaboration: Adaptation of Fast Multipole Code for Atomic-scale Micromagnetics]. Final Report: DE-FG02-98ER45714, report, November 22, 2002; Birmingham, Alabama. (https://digital.library.unt.edu/ark:/67531/metadc782013/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.