Magnetic-field-induced Crystallographic Texture Enhancement in Cold-deformed FePt/Fe3Pt Nanocomposites

We introduce a unique approach to obtaining anisotropic FePt/Fe3Pt nanocomposites with crystallographic texture of the hard phase: roll-bonding and magnetic annealing. Magnetic-field- induced crystallographic texture and magnetic property enhancement in cold-deformed Fe62Pt38 nanostructured magnets have been studied. Compared with the samples annealed without a magnetic field, the annealing in the presence of both out-of- plane and in-plane 19 T fields enhances texture of the hard FePt phase by about 50 %. Consequently, annealing samples in a 19 T field improves iHc, Br, and (BH)max. Especially, (BH)max was increased by 21 - 25 %. Additionally, magnetically anisotropic behavior and better squareness of the demagnetization curves were observed in the magnetically annealed samples. It is suggested that cold-rolling-induced textures in both Fe and Pt phases and magnetic-field-assisted phase transformation should be responsible for the notice improvement of the crystallographic texture and magnetic properties in the magnetically annealed samples.