Role of partial Cu/Co substitution on magnetic and electronic properties of Mn-rich Ni₄₆Mn₄₃In₁₁alloy

Origin of magnetoresistance across the martensitic transformation: formation of phase fraction

“…The change in electronic and magnetic structures near the martensite transformation (MT) in Ni-Mn based nonstoichiometric Heusler alloys lead to many interesting magnetic and transport properties [1][2][3][4][5][6][7]. It is well known that the MT is a solid to solid first order magnetostructural phase 8 These authors contributed equally to this work. 9 Authors to whom any correspondence should be addressed.…”

“…transition from high temperature austenite to low temperature martensite phases, in which the martensite phase may have a modulated/non-modulated tetragonal, orthorhombic or monoclinic structure [8][9][10][11][12][13][14][15], while the austenite is in the cubic L2 1 phase. The MT can be tuned by external parameters, such as annealing temperature, pressure and magnetic field, as well as by tuning the stoichiometry in these compounds [2,3,5,[16][17][18][19][20][21].…”

Effect of interfacial pinning on the thermo-remanent magnetization of disorder Mn50Ni38.5Sn11.5 alloy

“…Recently, offstoichiometric Mn-Ni-Z (Z¼Sn, In, Sb, Ga) alloys have drawn much attention due to their wide range of potential applications and fascinating magnetic behaviours [1][2][3][4][5][6]. Both the magnetic moment and the exchange interaction between the atoms are sensitive to the composition, symmetry and lattice parameters.…”

Origin of giant magnetoresistance across the martensitic transformation for Ni44Cu2Mn43In11 alloy: Formation of phase fraction

“…Thus, within the TW of MT both the austenite and martensite phase coexist in a metastable state. A giant magnetoresistance (GMR) is generally observed across the MT just like in multilayer systems, though the later has a different origin for its large MR. 4,8,9 Therefore, it is important to understand in detail the large magneto-resistive behaviour of these alloys across the MT as a function of applied field. To do so one needs to have knowledge on the existing volume faction of different phases at each temperature within the MT region when a field is applied or vice-versa.…”

“…The preparation of polycrystalline Ni 44 Cu 2 Mn 43 In 11 alloy and the measurements of resistivity is same as our earlier report. 9 The temperature dependent resistivity (ρ) data employing the zero field cooled cooling (ZFCC) and zero field cooled warming (ZFCW) protocols and the thermomagnetization (M (T )) curves obtained using the ZFCW protocol at a field (H=)100 Oe are shown in the fig. 1(a).…”