Giant magnetoresistance in the cluster glass regime of Co-Ga alloys

Abstract

A detailed study of low temperature electrical transport properties of CoxGa100−x (x = 54, 55.5, 57) alloy has been carried out. The origin of the resistivity anomalies and correlation between magnetic and electrical transport properties are identified through an elaborate analysis. The weak localization and enhanced electron-electron interaction effects partially support the electrical transport properties of the system. Further, the observed magnetoresistance can be well represented by localized model along with quantum corrections. The low temperature magnetoresistance value near critical composition is comparable to that reported in giant magnetoresistance materials.

Large Magnetoresistance and Magnetic Field Induced Strain in Ni42.8Co7.7Mn38.8Al10.7Heusler Alloy at Room Temperature

“…Ferromagnetic shape memory alloys (FSMA) have many functional properties like magnetic field induced strain (MFIS), magnetocaloric effect and giant magnetoresistance, which makes them a promising candidate for smart materials . The large magnetoresistance and MFIS in this system are the outcome of first‐order reversible structural transformation and twined martensitic phase . Ni‐Mn‐X (with X = Ga, In, Sn, or Sb) alloys have been the most intensively studied materials as they display multifunctional properties owning to lager change in magnetization across the martensitic transformation (MT).…”

“…[1][2][3][4] The large magnetoresistance and MFIS in this system are the outcome of first-order reversible structural transformation and twined martensitic phase. [1][2][3][4][5][6][7][8][9][10][11][12][13] Ni-Mn-X (with X ¼ Ga, In, Sn, or Sb) alloys have been the most intensively studied materials as they display multifunctional properties owning to lager change in magnetization across the martensitic transformation (MT). As one of the representative Heusler alloys, Ni-Mn-Al alloys have received little attention due to their ductility.…”