1. Thaum cov hluav taws xob tig, nws tsim cov hlau nplaum, uas yog qhov tseeb ntawm cov hlau nplaum. Ntev npaum li lub tshuab hluav taws xob tsis nres, cov hlau nplaum tsis tshua ploj. Thaum peb tseem hluas peb tau ua si nrog cov hlau nplaum ntau heev thiab lom zem heev. Nws tuaj yeem raug adsorbed ntawm txhua yam khoom uas muaj hlau. Tsis tas li ntawd, lawv nyiam thiab tawm tsam ib leeg. Peb kuj paub tias muaj cov ntsiab lus zoo thiab tsis zoo ntawm cov hlau nplaum. Tsuas yog ob tug ncej yog tib yam yuav nyiam ib leeg, txwv tsis pub, lawv yuav tawm tsam ib leeg. Tab sis puzzlingly, cov hlau nplaum yeej tsis zoo li poob nws lub hwj chim.
2. Lub zog ntawm cov hlau nplaum yog tsim los ntawm kev sib cuam tshuam ntawm hluav taws xob. Thaum nws los txog rau lub hauv paus ntawm magnetite lub magnetic quab yuam, peb yuav tsum tham txog lub magnetic teb ntawm lub atomic unit. Nyob rau hauv qhov tseeb, raws li lub magnetic teb ntawm lub atomic unit, txhua yam yog sib nqus. Nws tsuas yog tias tsuas yog hlau thiab npib tsib xee tuaj yeem qhia tau meej meej. Cov qauv ntawm magnetite muaj hlau thiab npib tsib xee. Qhov tseeb, txawm hais tias txhua yam yog sib nqus, tsuas yog hlau thiab npib tsib xee muaj kev sib koom ua ke ntawm cov hlau nplaum. Lwm yam khoom tau tawg mus rau hauv lub pob, thiab nws lub zog sib nqus nyob rau hauv cov lus qhia sib txawv, yog li qhov tshwm sim yeej tsis pom muaj cov hlau nplaum. Nws yuav tsum tau muab sau tseg tias vim muaj zog "hloov coupling" ntawm cov electrons ntawm ferromagnetic khoom, tom qab magnetization, txawm yog hais tias lub sab nraud magnetic teb raug tshem tawm, lub internal magnetic teb ntawm cov khoom ferromagnetic yuav nyob twj ywm unchanged, yog li qhia magnetic zog. ntawm qhov ntsuas macroscopic.
3. Ib qho atom muaj ib lub nucleus thiab electrons, qhov uas lub nucleus yog qhov zoo thiab cov electrons tsis zoo. Nyob rau hauv lub atom, electrons tas li txav ib ncig ntawm lub nucleus, thiab nyob rau tib lub sij hawm, lawv yog tas li spinning. Qhov kev txav ntawm electrons no tsim ib qho chaw sib nqus vim tias lub zog txav tsim hluav taws xob tam sim no, uas kuj tsim tau ib qho chaw sib nqus. Nyob rau hauv feem ntau cov khoom, vim lub disordered motion ntawm electrons, no magnetic nyhuv tsim los ntawm cov electrons tshem tawm ib leeg, yog li nthuav tawm macroscopic non-magnetism. Ntawm qhov tod tes, muaj kev sib cuam tshuam ntawm cov khoom siv hluav taws xob ntawm cov khoom siv ferromagnetic - "pab sib txuas", yog li ntawd cov hlau nplaum lawv tsim kom muaj kev sib koom ua ke hauv cov cheeb tsam me me, uas peb hu ua "magnetic domains".
