Dab tsi yog cov yam ntxwv ntawm cov khoom sib nqus

Dab tsi yog cov yam ntxwv ntawm cov khoom sib nqus? Magnetic Materials Ib yam khoom uas teb rau hauv ib txoj kev mus rau ib qho chaw sib nqus yog hu ua cov khoom sib nqus. Raws li lub zog sib nqus ntawm cov khoom nyob rau sab nraud magnetic teb, nws tuaj yeem muab faib ua cov khoom siv diamagnetic, paramagnetic khoom, ferromagnetic khoom, antiferromagnetic khoom thiab ferrimagnetic khoom.

1. Txawm tias tsis muaj qhov sib nqus sab nraud, tseem muaj lub sijhawm sib nqus mus tas li hauv txhua cheeb tsam me me (magnetic domain) hauv cov khoom. Txawm li cas los xij, thaum tsis muaj qhov sib nqus sab nraud hauv cov khoom siv hlau nplaum uas tsis muaj hlau nplaum, cov kev taw qhia ntawm lub sijhawm sib nqus ntawm txhua qhov sib nqus yog arbitrarily faib, thiab nws cov vector sum yog xoom, yog li cov khoom siv tag nrho tsis muaj hlau nplaum.

2. Yooj yim rau magnetize. Qhov no yog vim hais tias nyob rau hauv qhov kev txiav txim ntawm sab nraud magnetic teb, lub sij hawm sib nqus kev taw qhia ntawm txhua magnetic teb sim tig mus rau cov kev taw qhia ntawm lub magnetic teb, yog li ib tug loj sib nqus induction siv B yuav tau. Raws li cov qauv B=μrB0 (B0 yog qhov sib nqus induction hauv lub tshuab nqus tsev), qhov txheeb ze permeability μr ntawm cov khoom sib nqus yog loj heev. Qhov tseeb, μr ntawm cov khoom sib nqus mus txog 10-10, thaum lub μr ntawm cov khoom tsis sib nqus yog 1.

3. Muaj qhov tshwm sim ntawm kev sib nqus saturation, uas yog, B nce nrog qhov nce ntawm H, tab sis thaum nws nce mus rau ib qho nqi Bs, nws yuav tsis nce ntxiv nrog H. BS yog qhov saturation sib nqus induction ntawm cov khoom sib nqus. Yog vim li cas rau qhov saturation tshwm sim yog tias lub sij hawm sib nqus ntawm tag nrho cov sib nqus sib nqus tig mus rau cov kev taw qhia ntawm cov hlau nplaum thaum H mus txog ib qho nqi. Vim li no, B thiab H tsis muaj kev sib raug zoo, yog li qhov permeability tsis tas li, tab sis cuam tshuam nrog lub zog ntawm cov hlau nplaum.

4. Muaj hysteresis. Ntawd yog, qhov kev hloov ntawm cov hlau nplaum induction lags qab qhov kev hloov ntawm cov magnetic teb.