However, a metal causing a silicide reaction to occur at a higher temperature than Ni, i.e., for example, one of the following metals capable of forming a silicide having a higher melting point than Ni2Si or NiSi according to the relational expression ???Tf (the temperature at which a silicide reaction occurs)=0.4???Tm (the melting point of the silicide)??? disclosed, for example, in non-patent li