Ke hoʻomālamalama nei nā mea noiʻi mai NTNU i nā mea magnetic ma nā unahi liʻiliʻi ma o ka hana ʻana i nā kiʻiʻoniʻoni me ke kōkua ʻana o kekahi mau kukui X-alohi loa.
ʻO Erik Folven, ka luna hoʻomalu o ka hui uila oxide ma NTNU's Department of Electronic Systems, a me nā hoa hana mai NTNU a me Ghent University ma Belgium i hele e ʻike i ka loli ʻana o nā micromagnets kiʻiʻoniʻoni ʻoniʻoni i ka wā e hoʻopilikia ʻia e kahi kahua magnetic waho.ʻO ka hana, i uku ʻia e NTNU Nano a me ka Research Council of Norway, i paʻi ʻia ma ka puke pai Physical Review Research.
Mākēneki liʻiliʻi
Ua haku ʻo Einar Standal Digernes i nā mākēneki square liʻiliʻi i hoʻohana ʻia i nā hoʻokolohua.
ʻO nā mākēneki square liʻiliʻi, i hana ʻia e NTNU Ph.D.ʻO ka moho ʻo Einar Standal Digernes, he ʻelua micrometers wale nō ka laula a māhele ʻia i ʻehā mau ʻāpana triangular, kēlā me kēia me kahi ʻano hoʻokalakupua ʻokoʻa e kuhikuhi ana i ka uaki a i ʻole i ka ʻaoʻao ʻākau a puni nā magnet.
I loko o kekahi mau mea māke, hui pū nā hui liʻiliʻi o nā ʻātoma i nā wahi i kapa ʻia nā domains, kahi i loaʻa ai i nā electron a pau ke ʻano like.
I loko o ka NTNU magnets, hui kēia mau kikowaena ma kahi kikowaena-ka vortex core-kahi i kuhikuhi pololei ai ka manawa magnetic i loko a i waho paha o ka mokulele o ka mea.
"I ka wā e hoʻohana ai mākou i kahi māla magnetic, ʻoi aku ka nui o kēia mau kikowaena e kuhikuhi i ka ʻaoʻao like," wahi a Folven."Hiki iā lākou ke ulu a hiki ke emi, a laila hiki iā lākou ke hui pū kekahi i kekahi."
Electrons kokoke i ka mama o ka malamalama
ʻAʻole maʻalahi ka ʻike ʻana i kēia.Ua lawe nā mea noiʻi i kā lākou micromagnets i kahi synchrotron 80m-ākea donut-shaped, i kapa ʻia ʻo BESSY II, ma Berlin, kahi e hoʻolalelale ʻia ai nā electrons a hiki i ko lākou hele ʻana ma kahi kokoke i ka wikiwiki o ka māmā.ʻO kēlā mau electrons holo wikiwiki a laila e hoʻopuka i nā kukui X ʻālohilohi loa.
"Lawe mākou i kēia mau kukui X a hoʻohana iā lākou e like me ke kukui i kā mākou microscope," wahi a Folven.
No ka hele ʻana o nā electrons a puni ka synchrotron i loko o nā pūpū i hoʻokaʻawale ʻia e ʻelua nanoseconds, hiki mai nā kukui X a lākou e hoʻopuka ai i nā pulses pololei.
ʻO kahi microscope X-ray scan scanning, a i ʻole STXM, e lawe i kēlā mau kukui X no ka hana ʻana i kahi kiʻi kiʻi o ka hoʻolālā magnetic o ka mea.Ma ka hui ʻana i kēia mau kiʻi paʻi, hiki i nā mea noiʻi ke hana maoli i kahi kiʻiʻoniʻoni e hōʻike ana i ka loli ʻana o ka micromagnet i ka manawa.
Me ke kōkua ʻana o ka STXM, ua hoʻopilikia ʻo Folven a me kāna mau hoa hana i kā lākou micromagnets me ka pulse o kēia manawa i hoʻoulu ai i kahi māla magnetic, a ʻike i ka loli ʻana o nā kāʻei a me ka neʻe ʻana o ka vortex core mai ke kikowaena.
"He ʻuʻuku liʻiliʻi kāu, a laila ʻoe e hoʻoheheʻe iā ia a hoʻāʻo e kiʻi iā ia i ka wā e noho hou ai," wahi āna.Ma hope iho, ʻike lākou i ka hoʻi ʻana o ke kumu i waena—akā ma ke ala wiliwili, ʻaʻole laina pololei.
"E ʻano hula ia i ke kikowaena," wahi a Folven.
Hoʻokahi paheʻe a ua pau
ʻO ia ke aʻo ʻana i nā mea epitaxial, i hana ʻia ma luna o kahi substrate e hiki ai i nā mea noiʻi ke hoʻololi i nā waiwai o ka mea, akā e ālai i nā kukui X i kahi STXM.
Ke hana nei ma NTNU NanoLab, ua hoʻoponopono nā mea noiʻi i ka pilikia substrate ma ke kanu ʻana i kā lākou micromagnet ma lalo o kahi papa kalapona e pale i kāna mau waiwai magnetic.
A laila ʻoki pono lākou i ka substrate ma lalo me kahi kaola o nā iona gallium a hiki i kahi ʻāpana lahilahi loa i koe.Hiki i ke kaʻina hana paʻakikī ke lawe i ʻewalu hola no kēlā me kēia laʻana—a ʻo kekahi paheʻe hiki ke hōʻike i ka pōʻino.
"ʻO ka mea koʻikoʻi, inā e pepehi ʻoe i ka magnetism, ʻaʻole mākou e ʻike ma mua o ko mākou noho ʻana ma Berlin," wahi āna."ʻO ka hoʻopunipuni, ʻoiaʻiʻo, e lawe mai i hoʻokahi laʻana."
Mai ka physics kumu a hiki i nā mea hana e hiki mai ana
Mahalo ua hana ʻia, a ua hoʻohana ka hui i kā lākou mau laʻana i hoʻomākaukau pono ʻia e kiʻi i ke ʻano o ka ulu ʻana a me ka emi ʻana o nā kikowaena micromagnet i ka wā.Ua hana pū lākou i nā hoʻohālikelike kamepiula e hoʻomaopopo maikaʻi i nā mana e hana nei.
A me ka hoʻonui ʻana i kā mākou ʻike no ka physics kumu, ʻo ka hoʻomaopopo ʻana i ka hana ʻana o ka magnetism i kēia mau pae lōʻihi a me ka manawa hiki ke kōkua i ka hana ʻana i nā mea e hiki mai ana.
Ua hoʻohana ʻia ka Magnetism no ka mālama ʻana i ka ʻikepili, akā ke ʻimi nei nā mea noiʻi i nā ala e hoʻohana hou aku ai.No ka laʻana, hiki ke hoʻohana ʻia nā kuhikuhina magnetic o ka vortex core a me nā kikowaena o kahi micromagnet e hoʻopili ai i ka ʻike ma ke ʻano o 0s a me 1s.
Ke manaʻo nei nā mea noiʻi e hana hou i kēia hana me nā mea anti-ferromagnetic, kahi e hoʻopau ai ka hopena ʻupena o kēlā me kēia manawa magnetic.He mea hoʻohiki kēia i ka wā e pili ana i ka helu ʻana - ma ke kumumanaʻo, hiki ke hoʻohana ʻia nā mea anti-ferromagnetic e hana i nā mea e koi ai i ka ikehu liʻiliʻi a noho paʻa ʻoiai ke nalowale ka mana - akā ʻoi aku ka maʻalahi o ka noiʻi ʻana no ka mea ʻoi aku ka nāwaliwali o nā hōʻailona a lākou e hana ai. .
ʻOiai kēlā paʻakikī, manaʻo maikaʻi ʻo Folven."Ua uhi mākou i ka ʻāina mua ma ka hōʻike ʻana hiki iā mākou ke hana i nā laʻana a nānā iā lākou me nā kukui X," wahi āna."ʻO ka hana aʻe e ʻike inā hiki iā mākou ke hana i nā laʻana o ke kiʻekiʻe kiʻekiʻe e loaʻa ai ka hōʻailona mai kahi mea anti-ferromagnetic."
Ka manawa hoʻouna: Mei-10-2021