Abstract
The effect of substrates on the magnetic and transport properties of Ni2Mn1.5In0.5 ultra-thin films were studied theoretically and experimentally. High quality 8-nm films were grown by laser-assisted molecular beam epitaxy deposition. Magneto-transport measurements revealed that the films undergo electronic structure transformation similar to those of bulk materials at the martensitic transformation. The temperature of the transformation depends strongly on lattice parameters of the substrate. To explain this behavior, we performed DFT calculations on the system and found that different substrates change the relative stability of the ferromagnetic (FM) austenite and ferrimagnetic (FiM) martensite states. We conclude that the energy difference between the FM austenite and FiM martensite states in Ni2Mn1.5In0.5 films grown on MgO (001) substrates is ΔE = 0.20 eV per NiMnIn f.u, somewhat lower compared to ΔE = 0.24 eV in the bulk material with the same lattice parameters. When the lattice parameters of Ni2Mn1.5In0.5 film have values close to those of the MgO substrate, the energy difference becomes ΔE = 0.08 eV per NiMnIn f.u. These results suggest the possibility to control the martensitic transition in thin films through substrate engineering.
Highlights
The off-stoichiometric Ni-Mn-In based Heusler alloys attract tremendous research attention due to their wide variety of magnetoresponsive effects[1,2] such as magnetic shape memory/strain[3,4] large magnetoresistance[5,6] anomalous Hall effect,[7] and magnetocaloric effects.[8,9,10] Such a variety of coupled magnetic, structural, and elastic properties make Ni-Mn-In alloys excellent candidates for multifunctional applications
We conclude that the energy difference between the FM austenite and FiM martensite states in Ni2Mn1.5In0.5 films grown on MgO (001) substrates is ∆E = 0.20 eV per NiMnIn f.u, somewhat lower compared to ∆E = 0.24 eV in the bulk material with the same lattice parameters
In this paper we report our study of the impact of substrates on the magnetic and magnetotransport properties of martensitic transformation in 8-nm thick Ni50Mn35In15 shape memory alloy thin films
Summary
The temperature of the transformation depends strongly on lattice parameters of the substrate. To explain this behavior, we performed DFT calculations on the system and found that different substrates change the relative stability of the ferromagnetic (FM) austenite and ferrimagnetic (FiM) martensite states. We conclude that the energy difference between the FM austenite and FiM martensite states in Ni2Mn1.5In0.5 films grown on MgO (001) substrates is ∆E = 0.20 eV per NiMnIn f.u, somewhat lower compared to ∆E = 0.24 eV in the bulk material with the same lattice parameters.
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