Abstract
A series of Fe2MnSi1−xBx (x = 0–0.4) Heusler alloys was synthesized and investigated. The variation of lattice parameters with B content suggests that B prefers entering the substitutional site of Fe2MnSi when the amount is small. But when B content is high, it enters the interstitial site. A spin reorientation is observed at ~54 K in Fe2MnSi, which moves to low temperatures with increasing B content and disappears when x = 0.3. Both the Curie temperature TC and saturation magnetization Ms increase with the substitution of B for Si. The Ms gets closer to the calculated total spin moment Mt. All this suggests that the dope of B can enhance the ferromagnetic character of Fe2MnSi1−xBx. For the high B content, B-doping expands the lattice and enlarges the distance between magnetic atoms. This leads to the increase of Fe and Mn spin moments. The substitution of B for Si has an ordering-effect for Fe2MnSi lattice by forming a strong covalent bonding and relieves the possible Fe-Mn disorder. This effect also contributes to the increase of Ms.
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