Cov kws tshawb fawb los ntawm NTNU tab tom tso lub teeb ntawm cov khoom sib nqus ntawm cov nplai me me los ntawm kev tsim cov yeeb yaj kiab nrog kev pab los ntawm qee qhov ci ntsa iab heev.
Erik Folven, tus thawj coj ntawm pawg oxide electronics ntawm NTNU Lub Tsev Haujlwm Saib Xyuas Kev Siv Hluav Taws Xob, thiab cov npoj yaig los ntawm NTNU thiab Ghent University hauv Belgium tau teeb tsa los saib seb cov zaj duab xis nyias nyias hloov pauv li cas thaum cuam tshuam los ntawm sab nraud magnetic teb.Cov hauj lwm, ib feem nyiaj txiag los ntawm NTNU Nano thiab Pawg Neeg Tshawb Fawb ntawm Norway, tau luam tawm hauv phau ntawv Journal Physical Review Research.
Cov hlau nplaum me me
Einar Standal Digernes tau tsim cov hlau nplaum me me uas siv hauv kev sim.
Cov hlau nplaum me me, tsim los ntawm NTNU Ph.D.Tus neeg sib tw Einar Standal Digernes, tsuas yog ob lub micrometers dav thiab faib ua plaub daim duab peb sab, txhua tus muaj qhov sib txawv sib nqus taw qhia clockwise los yog tiv thaiv clockwise nyob ib ncig ntawm cov hlau nplaum.
Hauv qee cov khoom sib nqus, cov pab pawg me ntawm cov atoms ua ke rau hauv cov cheeb tsam hu ua domains, nyob rau hauv uas txhua tus electrons muaj tib yam sib nqus orientation.
Hauv NTNU cov hlau nplaum, cov domains sib ntsib ntawm lub hauv paus ntsiab lus - lub vortex core - qhov twg lub sij hawm sib nqus taw tes ncaj qha rau hauv lossis tawm ntawm lub dav hlau ntawm cov khoom.
Folven hais tias "Thaum peb siv thaj chaw sib nqus, ntau thiab ntau ntawm cov thawj coj no yuav taw tes rau tib qho kev taw qhia," Folven hais."Lawv tuaj yeem loj hlob thiab lawv tuaj yeem txo qis, thiab tom qab ntawd lawv tuaj yeem sib koom ua ke."
Electrons yuav luag ntawm qhov ceev ntawm lub teeb
Pom qhov no tshwm sim tsis yooj yim.Cov kws tshawb fawb tau coj lawv cov micromagnets mus rau 80m-dav donut-shaped synchrotron, hu ua BESSY II, hauv Berlin, qhov chaw electrons tau nrawm kom txog thaum lawv mus ncig yuav luag qhov nrawm ntawm lub teeb.Cov electrons ceev ceev ces emit X-rays ci ntsa iab heev.
Folven hais tias "Peb coj cov X-rays thiab siv lawv ua lub teeb hauv peb lub tshuab tsom iav," hais tias Folven.
Vim tias cov hluav taws xob taug kev ncig lub synchrotron hauv pawg sib cais los ntawm ob nanoseconds, X-rays lawv tawm tuaj hauv cov pulses meej.
Lub tshuab xa hluav taws xob xa hluav taws xob, lossis STXM, siv cov X-rays los tsim cov duab ntawm cov khoom siv hlau nplaum.Los ntawm stitching cov snapshots ua ke, cov kws tshawb fawb tuaj yeem tsim cov yeeb yaj kiab uas qhia tias micromagnet hloov pauv li cas thaum lub sijhawm.
Nrog kev pab los ntawm STXM, Folven thiab nws cov npoj yaig cuam tshuam lawv cov micromagnets nrog lub mem tes ntawm cov tam sim no uas tsim cov hlau nplaum, thiab pom cov domains hloov cov duab thiab cov vortex core txav los ntawm qhov chaw.
"Koj muaj cov hlau nplaum me me, thiab tom qab ntawd koj rub nws thiab sim ua duab nws thaum nws rov qab los," nws hais.Tom qab ntawd, lawv pom cov tub ntxhais rov qab mus rau qhov nruab nrab-tab sis raws txoj kev winding, tsis yog txoj kab ncaj nraim.
Folven hais tias "Nws yuav zoo li seev cev rov qab mus rau qhov chaw," Folven hais.
Ib qho plam thiab nws dhau lawm
Qhov ntawd yog vim lawv kawm cov ntaub ntawv epitaxial, uas yog tsim nyob rau sab saum toj ntawm lub substrate uas tso cai rau cov kws tshawb fawb los tweak cov khoom ntawm cov khoom, tab sis yuav thaiv cov X-rays hauv STXM.
Ua hauj lwm hauv NTNU NanoLab, cov kws tshawb fawb tau daws qhov teeb meem ntawm substrate los ntawm kev faus lawv cov micromagnet nyob rau hauv ib txheej ntawm carbon los tiv thaiv nws cov khoom sib nqus.
Tom qab ntawd lawv ua tib zoo thiab raug muab tshem tawm ntawm lub substrate hauv qab nrog lub teeb tsom ntawm gallium ions kom txog thaum tsuas yog ib txheej nyias heev.Cov txheej txheem mob hnyav tuaj yeem siv yim teev rau ib tus qauv - thiab ib qho kev swb tuaj yeem cuam tshuam kev puas tsuaj.
"Qhov tseem ceeb tshaj plaws yog tias, yog tias koj tua cov hlau nplaum, peb yuav tsis paub tias ua ntej peb zaum hauv Berlin," nws hais."Qhov ua kom yuam kev yog, tau kawg, coj ntau dua ib tus qauv."
Los ntawm qhov tseem ceeb physics mus rau yav tom ntej cov cuab yeej
Ua tsaug uas nws tau ua haujlwm, thiab pab pawg tau siv lawv cov qauv npaj ua tib zoo los piav qhia seb cov micromagnet cov npe loj hlob li cas thiab txo qis lub sijhawm.Lawv kuj tau tsim lub computer simulation kom nkag siab zoo dua li cas lub zog tau ua haujlwm.
Ntxiv nrog rau kev txhawb nqa peb txoj kev paub txog lub hauv paus physics, kev nkag siab tias cov hlau nplaum ua haujlwm li cas ntawm qhov ntev thiab lub sijhawm teev yuav pab tau rau kev tsim cov cuab yeej siv yav tom ntej.
Magnetism twb tau siv rau cov ntaub ntawv khaws cia, tab sis tam sim no cov kws tshawb fawb tab tom nrhiav txoj hauv kev los siv nws ntxiv.Piv txwv li, cov kev taw qhia sib nqus ntawm lub vortex core thiab cov thawj ntawm micromagnet, piv txwv li, tej zaum yuav raug siv los encode cov ntaub ntawv nyob rau hauv daim ntawv ntawm 0s thiab 1s.
Cov kws tshawb fawb tam sim no tau tsom mus ua haujlwm rov ua haujlwm nrog cov khoom siv tshuaj tiv thaiv ferromagnetic, qhov twg cov txiaj ntsig ntawm tus neeg sib nqus lub sijhawm tshem tawm.Cov no tau cog lus thaum nws los txog rau kev suav - hauv txoj kev xav, cov khoom siv los tiv thaiv ferromagnetic tuaj yeem siv los ua cov khoom siv uas xav tau lub zog me me thiab nyob ruaj khov txawm tias lub zog poob - tab sis ntau qhov nyuaj los tshawb xyuas vim tias cov teeb liab lawv tsim yuav tsis muaj zog dua. .
Txawm hais tias qhov kev sib tw ntawd, Folven yog qhov zoo."Peb tau npog thawj qhov av los ntawm kev qhia tias peb tuaj yeem ua cov qauv thiab saib lawv nrog X-rays," nws hais."Cov kauj ruam tom ntej yuav yog saib seb peb puas tuaj yeem ua cov qauv zoo txaus kom tau txais cov teeb liab txaus los ntawm cov khoom siv los tiv thaiv ferromagnetic."
Post lub sij hawm: May-10-2021