Growth temperature controlled magnetism in molecular beam epitaxially grown Ni2MnAl Heusler alloy

Combinatorial Investigation of Ferromagnetic Shape-Memory Alloys in the Ni-Mn-Al Ternary System Using a Composition Spread Technique

“…7,19,28,30) It is known that the nominal Ni 2 MnAl composition can display ferromagnetism or antiferromagnetism depending on processing conditions, and in turn on the degree of order/disorder. 17,19,33) We believe that this is the main reason for the discrepancy between our findings in Region A and other reports.…”

“…This is in agreement with other published work. [8][9][10]17,[20][21][22][23][24] Previously, Kainuma, et al 9,20) also mapped the martensites in this region and reported a similar trend.…”

“…Recently, there have also been reports on NiMn-Al thin films. 2,17) There are some discrepancies in the reported magnetic properties of Ni-Mn-Al alloys. This appears to originate from the sensitivity of the properties on thermal treatment, which varies among different studies.…”

Structural-induced antiferromagnetism in Mn-based full Heusler alloys: The case of Ni2MnAl

“…The Néel temperature for the AFM B2 phase was found to be 313 K and the Curie temperature for the FM L2 1 phase 375 K. Similar results were also produced by Dong et al in the case of thin films of Ni 2 MnAl grown on GaAs͑001͒ using molecular beam epitaxy and no sole L2 1 phase could be produced. 16 The competition between the FM and AFM ordering has been also observed on films by Paduani et al 17 A mixed Ni 2 Mn͑Ga x Al 1−x ͒ alloy has been also proposed as an intermediate way to combine the mechanical properties of Ni 2 MnAl and the easily achieved ordering of the L2 1 structure in Ni 2 MnGa which is essential for the martensitic transition to occur. 18 The mixed B2 / L2 1 of Ni 2 MnAl has been used to produce negative magnetoresistance ratio in granular films.…”

First‐principles calculations of structural, elastic and electronic properties of Ni2MnZ (Z = Al, Ga and In) Heusler alloys

“…These alloys exhibit a strong magnetoelastic coupling resulting in interesting magnetomechanical properties. Among them Ni 2 MnGa, Ni 2 MnAl and Ni 2 MnIn compounds crystallize in the Heusler structure [1][2][3][4]. These materials possess an imbalance of the density of states for two spin orientations at the Fermi energy.…”