Magnetization yog txheej txheem ntawm kev ua cov hlau nplaum hlau tawm ntawm cov hlau nplaum ruaj khov. Qhov no yog ua los ntawm kev nthuav tawm cov hlau nplaum tas mus li rau qhov chaw sib nqus, feem ntau yog electromagnet. Lub zog ntawm cov hlau nplaum yog nyob ntawm seb cov khoom siv tau raug rau cov hlau nplaum ntev npaum li cas thiab nws muaj zog npaum li cas. Muaj plaub hom hlau nplaum uas tuaj yeem tsim los ntawm cov txheej txheem no: Cov hlau nplaum tas mus li, Neodymium Magnets, Samarium Cobalt Magnets, thiab Alnico Magnets. Txhua yam ntawm cov hlau nplaum no muaj cov khoom sib txawv thiab siv nyob ntawm seb hom khoom siv los tsim lawv.
Cov hlau nplaum tas mus li yog cov ntaub ntawv zoo tshaj plaws ntawm cov khoom siv hlau nplaum thiab tuaj yeem pom hauv cov khoom siv niaj hnub xws li cov hlau nplaum tub yees thiab lub tswb nrov.
Cov hlau nplaum neodymium muaj zog dua li cov hlau nplaum ruaj khov thiab tuaj yeem siv rau hauv lub cev muaj zog, tshuab hluav taws xob, thiab qee yam khoom siv kho mob.
Samarium Cobalt Magnets kuj muaj zog tab sis tsis muaj zog li Neodymium Magnets; Lawv feem ntau siv hauv MRI tshuab rau kev yees duab.
Thaum kawg, Alnico Magnets paub tias muaj cov khoom sib nqus siab tshaj plaws ntawm txhua hom hlau nplaum thiab siv ntau yam kev siv xws li hais lus nrov, khoos phis tawj hard drive, thiab MRI tshuab.
Cov txheej txheem ntawm Magnetization
Cov neeg siv khoom tshiab feem ntau yuav xav paub seb lawv paub txog cov hlau nplaum li cas lossis siv lawv li cas. Peb tau sau qee cov ntaub ntawv yooj yim txog polarization.
Txoj kev sib nqus ntawm cov hlau nplaum yog hais txog cov txheej txheem siv los tsim cov hlau nplaum hlau nplaum. Muaj ntau ntau txoj hauv kev los tsim cov hlau nplaum sib nqus hauv cov hlau nplaum, suav nrog cov hlau nplaum zoo li qub thiab dynamic lossis induced magnetization.
Static magnetization yog ua tiav los ntawm aligning lub atoms nyob rau hauv cov khoom ntawm cov hlau nplaum kom nws cov electrons tag nrho cov spin nyob rau hauv tib txoj kev - qhov no aligns "magnetic domain" nyob rau hauv cov khoom thiab ua ib tug magnetized magnet. Txoj kev no feem ntau yog siv los tsim cov hlau nplaum ruaj khov vim nws yuav tsum tsis muaj kev quab yuam sab nraud los tswj nws cov khoom sib nqus.
Dynamic los yog induced magnetization tshwm sim thaum lub zog sab nraud (xws li hluav taws xob tam sim no) raug siv rau ib qho khoom siv tsis muaj hlau nplaum, ua rau nws dhau los ua hlau nplaum ib ntus. Txoj kev no feem ntau yog siv los tsim cov hlau nplaum thiab lwm yam hlau nplaum uas tuaj yeem qhib lossis tawm raws li xav tau.
Ntxiv nrog rau ob txoj kev magnetization no, kuj tseem muaj lwm txoj hauv kev xws li cryogenic magnetization thiab high-frequency alternating current (AC) magnetization. Txhua txoj hauv kev no muaj nws cov txiaj ntsig thiab qhov tsis zoo, yog li nws tseem ceeb heev uas yuav tsum xaiv qhov zoo rau koj daim ntawv thov. Txawm hais tias siv txoj kev magnetization, nws yog ib qho tseem ceeb uas yuav tsum tau ua tib zoo saib xyuas cov txheej txheem thiab xyuas kom meej tias cov hlau nplaum tseem nyob ruaj khov kom tswj tau nws cov khoom sib nqus uas xav tau.
Magnetization ntawm cov hlau nplaum ruaj khov
Muaj ob txoj hauv kev uas feem ntau siv los ua cov hlau nplaum ruaj khov: static magnetization thiab mem tes magnetization. Tus thawj magnetizes ntawm ib tug zoo li qub electromagnetic teb thiab ib txwm tsuas generates ib magnetic teb txog li 2MA / m. Pulse magnetization, ntawm qhov tod tes, yog siv thaum muaj zog magnetic teb xav tau, los yog rau multipolar magnetization. Txhua txoj kev yog optimized rau cov ntaub ntawv tshwj xeeb, cov duab thiab polar configurations.
Kev xa cov hlau nplaum ruaj khov
Kev tuav cov hlau nplaum hlau nplaum yuav ua rau muaj teeb meem loj rau kev thauj mus los thiab kev sib dhos. Lawv tuaj yeem ua rau raug mob vim muaj kev phom sij txaus ntshai, nyiam av lossis yuav nyuaj rau khaws cia hauv lawv qhov chaw sib dhos. Yog li qhov yooj yim tuav ntawm cov hlau nplaum tsis muaj hlau nplaum thaum thauj thiab sib dhos feem ntau yuav tsum muaj qhov sib nqus sib nqus ntawm tag nrho sib sau ua ke ntawm lwm tus. Cov hlau nplaum loj, cov hlau nplaum ruaj khov tuaj yeem ua kom puas lossis tsoo lub cev ntawm cov neeg tsiv cov khoom. Yog tias cov hlau nplaum magnetized nyob rau hauv lub Hoobkas, nws tuaj yeem cuam tshuam rau cov cuab yeej navigational, tshwj xeeb tshaj yog nyob rau hauv dav hlau, thaum tsiv, yog vim li cas cov cai tswj kev xa khoom ntawm cov hlau nplaum hlau nplaum.
