Abstract
We have investigated the electron spin resonance (ESR) of the Ni45Cr5Mn37In13 Heusler alloy near the structural and magnetic phase transition temperatures. Ni45Cr5Mn37In13 is characterized by a first order magnetostructural (martensitic) transition (MST) with magneto-responsive properties such as magnetoresistance, Hall and magnetocaloric effects, etc., in the vicinity of the MST. Since the details and origins of these behaviors are not well understood, we used a technique beyond magnetometry, i.e., “microwave absorption”, to reveal new information. ESR studies of Ni45Cr5Mn37In13 shows that this compound is characterized by wide absorption spectra at temperatures greater than 250 K that depend on the angle of the magnetic field relative to the normal to the sample plate (α) and temperature (T). Two local maxima at about 5 and 6 kOe were detected for α close to zero degrees near the martensitic transition and Curie temperatures. The absorption spectra are discussed along with the results of the structural and magnetic studies.
Highlights
The Mn-based off-stoichiometric Heusler alloys are ternary intermetallic compounds, described as Ni2Mn1-xZx, with Z = Ga, In, Sn, Sb
We report the results of the studies of the change in the electron spin resonance (ESR) properties resulting from the temperature induced MST between paramagnetic austenitic (PA) and ferromagnetic martensitic (FA) phases in Ni45Cr5Mn37In13 Heusler alloy
Since the relative intensity of the martensitic phase was very low in comparison to the austenitic phase, it was difficult to differentiate whether the martensitic phase is modulated or not
Summary
TCM and TM are known to be extremely sensitive to small variations in the chemical composition for Ni50Mn35In15 compounds.[12] This can result in a shift of TCM and TM toward TC and, in some cases, the martensitic transition coincides with the ferromagnetic ordering temperature (TC). In this case, MSTs from a ferromagnetic martensitic to paramagnetic austenitic phase were observed.[13,14]. We report the results of the studies of the change in the ESR properties resulting from the temperature induced MST between paramagnetic austenitic (PA) and ferromagnetic martensitic (FA) phases in Ni45Cr5Mn37In13 Heusler alloy
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