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We report on the investigation of coercivity changes of theCo$_{72}$Pt$_{28}$/Co$_{81}$Ir$_{19}$ exchange-coupled composite (ECC) mediawith negative soft-layer (SL) magnetocrystalline anisotropy (MA) . Our resultsshow that the hard-layer (HL) of our sample exhibits a columnar typemicrostructure with well isolated grains and the SL with hcp-structure grows ontop of the HL with the same texture. Therefore, strong coupling of the twolayers have been realized as evidenced by the magnetic characterization.Importantly, we observe a more effective reduction of the coercivity of the ECCmedia by using SLs with negative MA when compared to the use of SLs withpositive or negligible MA. The experimental results are corroborated bytheoretical calculations.

journal of physics. d, applied physics

Effective reduction of the coercivity for Co$_{72}$Pt$_{28}$ thin film  by exchange coupled Co$_{81}$Ir$_{19}$ soft layer with negative  magnetocrystalline anisotropy