Ua ntej, cov yam ntxwv ntawm cov khoom sib nqus
1. Magnetization nkhaus ntawm cov khoom sib nqus
Cov khoom siv hlau nplaum yog tsim los ntawm cov tshuaj ferromagnetic los yog ferromagnetic tshuaj, nyob rau hauv qhov kev txiav txim ntawm sab nraud magnetic teb H, yuav tsum muaj ib tug sib nqus magnetization M los yog sib nqus induction intensity B, lawv hloov nrog lub magnetic teb zog H nkhaus hu ua magnetization nkhaus (M ~ H. los yog B ~ H nkhaus). Lub magnetization nkhaus feem ntau yog nonlinear thiab muaj ob yam ntxwv: magnetic saturation phenomenon thiab hysteresis phenomenon. Ntawd yog, thaum qhov sib nqus qhov sib nqus H yog qhov loj txaus, qhov sib nqus sib nqus M tau nce mus txog qee qhov nqi saturation Ms, thiab tseem nce H, thiab Ms tseem tsis hloov. Thaum M tus nqi ntawm cov khoom mus txog saturation, thiab sab nraud magnetic teb H txo mus rau xoom, M tsis rov qab mus rau xoom, tab sis hloov raws Ms-Mr nkhaus. Lub xeev ua haujlwm ntawm cov khoom siv sib npaug rau qee qhov taw qhia ntawm MH nkhaus lossis BH nkhaus, uas feem ntau hu ua qhov chaw ua haujlwm.
Thib ob, qhov sib nqus tsis sib nqus ntawm cov khoom siv hlau nplaum
Saturation magnetic induction intensity Bs: nws qhov loj me yog nyob ntawm qhov muaj pes tsawg leeg ntawm cov khoom, thiab nws lub cev sib xws yog cov magnetization vector zoo zoo hauv cov khoom.
Residual magnetic induction Br: yog tus yam ntxwv parameter ntawm lub voj hysteresis, tus nqi B thaum H rov qab mus rau 0.
Rectangle ratio: Br/Bs
Coercive force Hc: yog tus nqi uas qhia txog qhov nyuaj ntawm kev sib nqus cov khoom, nyob ntawm seb muaj pes tsawg leeg thiab qhov tsis xws ntawm cov khoom ( impurities, stresses, thiab lwm yam).
Permeability μ : yog qhov piv ntawm B rau H sib raug rau txhua qhov taw tes ntawm lub voj voog hysteresis, thiab muaj feem cuam tshuam nrog lub xeev kev khiav haujlwm ntawm lub cuab yeej.
Initial permeability μi, siab tshaj permeability μm, sib txawv permeability μd, amplitude permeability μa, zoo permeability μe, mem tes permeability μp.
Curie kub Tc: Lub magnetization ntawm ferromagnetic tshuaj txo nrog qhov nce ntawm qhov kub thiab txias, thiab thaum twg ib tug kub mus txog, lub spontaneous magnetization ploj mus thiab ua paramagnetism, thiab qhov tseem ceeb kub yog Curie kub. Nws txiav txim siab lub siab txwv qhov kub ntawm qhov khoom siv hlau nplaum tuaj yeem ua haujlwm.