Curie–Weiss law

<p>In <a href="/facts/Magnetism/eo75vApl">magnetism</a>, the Curie–Weiss law describes the <a href="/facts/Magnetic_susceptibility/hWMbGTjP">magnetic susceptibility</a>  χ of a <a href="/facts/Ferromagnet/fH3HFnSl">ferromagnet</a> in the <a href="/facts/Paramagnetic/vj1SMbbp">paramagnetic</a> region above the <a href="/facts/Curie_temperature/ygotSuMg">Curie temperature</a>:
</p>

χ
        =
        
          
            C
            
              T
              −
              
                T
                
                  
                    C
                  
                
              
            
          
        
      
    
    {\displaystyle \chi ={\frac {C}{T-T_{\rm {C}}}}}

<p>where  C is a material-specific <a href="/facts/Curie_constant/xc7Sjgym">Curie constant</a>,  T is the absolute temperature, and  TC is the <a href="/facts/Curie_temperature/ygotSuMg">Curie temperature</a>, both measured in <a href="/facts/Kelvin/E3trzC4C">kelvin</a>. The law predicts a singularity in the susceptibility at  T = TC. Below this temperature, the ferromagnet has a <a href="/facts/Spontaneous_magnetization/QMewMfQu">spontaneous magnetization</a>. The name is given after <a href="/facts/Pierre_Curie/Sbtlw2xj">Pierre Curie</a> and <a href="/facts/Pierre_Weiss/W48QMtpT">Pierre Weiss</a>.
</p>

Curie–Weiss law open-in-new

Curie–Weiss law