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The structure, magnetic properties and martensitic transformation behaviour were investigated for as-spun Co 50 Ni 20 Ga 30 ribbons under various heat-treatment conditions. When the as-spun ribbons were annealed at 400 • C, the saturation magnetization decreased from 49.5 to 40.1 emu g −1 and the coercivity increased from 18 to 2622 Oe, accompanied by the disappearance of the martensitic transformation. Re-treating the annealed sample at different temperatures from 600 to 1200 • C, thedoi:10.1088/0022-3727/39/14/002 fatcat:m2ln6gh3mzc3neumfqbavdmxnq