Electron Magnetic Resonance Study of the Ni47Co3Mn35.5In14.5 Ribbons

In this paper, the electron magnetic resonance (EMR) of Ni47Co3Mn35.5In14.5 alloy in ribbon and powder form are investigated. The EMR spectra for ribbons were registered within the temperature ranges 4 K .T.100 K and 140 K .T.380 K and for powdered ribbon within the temperature range 140 K .T.380 K. Additionally, the magnetic properties of ribbon were also studied by using vibrating sample magnetometer (VSM) in the temperature range of 85 K .T.400 K. At high temperature, the EMR signal consist of a single, asymmetric line. The temperature dependence of the inverse integrated intensity exhibits a Curie?Weiss like behaviour and Curie temperature (TC) determined from VSM equals 333 K. Below TC for ribbon sample the low field microwave absorption (LFMA) line was observed. The EMR spectra recorded for the powder sample are of a different shape than those for the ribbon sample. The powdering causes an increase of the effective skin depth, and the high-temperature lines lose asymmetric character. The Curie temperature is shifted relative to Curie temperature determined for the ribbon sample, but the structural phase transition is preserved.