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<p>This work investigates the structural and magnetic properties of the off-stoichiometric Heusler alloy Fe₁₁Mn₂Ga₃. X-ray diffraction confirms a face-centered cubic L2₁ structure with significant chemical disorder. Magnetic characterization reveals a complex phase diagram with two distinct transitions: a Curie temperature at T<sub>m2</sub> =309&#xa0;K and a magnetic reorientation at T<sub>m1</sub> =167&#xa0;K, below which antiferromagnetic interactions dominate, evidenced by a reentrant decrease in magnetization. This behavior yields a bifunctional magnetocaloric response, with a direct effect near T<sub>m1</sub> and an inverse effect near T<sub>m2</sub>. Mössbauer spectroscopy confirms a ferrimagnetic state at room temperature and provides microscopic evidence for the development of non-collinear magnetism at low temperatures. The novelty of these results lies in the consequences of the strong Fe-rich off-stoichiometry, which stabilizes chemical disorder and shifts the balance beteween competing ferromagnetic and antiferromagnetic interactions to unusually high temperatures. The results demonstrate that strategic off-stoichiometry is a powerful tool for stabilizing disordered states and engineering novel magnetic functionality in Heusler alloys.</p>

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Structural and magnetic properties of Fe11Mn2Ga3: an off-stoichiometric Heusler alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月3日

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  • Oswaldo Morales,
  • Fernando Plazaola,
  • José F. Marco,
  • Víctor A. Peña,
  • Víctor Rojo,
  • José Emilio Prieto,
  • Juan de la Figuera,
  • Juan Z. Dávalos

摘要

This work investigates the structural and magnetic properties of the off-stoichiometric Heusler alloy Fe₁₁Mn₂Ga₃. X-ray diffraction confirms a face-centered cubic L2₁ structure with significant chemical disorder. Magnetic characterization reveals a complex phase diagram with two distinct transitions: a Curie temperature at Tm2 =309 K and a magnetic reorientation at Tm1 =167 K, below which antiferromagnetic interactions dominate, evidenced by a reentrant decrease in magnetization. This behavior yields a bifunctional magnetocaloric response, with a direct effect near Tm1 and an inverse effect near Tm2. Mössbauer spectroscopy confirms a ferrimagnetic state at room temperature and provides microscopic evidence for the development of non-collinear magnetism at low temperatures. The novelty of these results lies in the consequences of the strong Fe-rich off-stoichiometry, which stabilizes chemical disorder and shifts the balance beteween competing ferromagnetic and antiferromagnetic interactions to unusually high temperatures. The results demonstrate that strategic off-stoichiometry is a powerful tool for stabilizing disordered states and engineering novel magnetic functionality in Heusler alloys.