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FePt is the primary material being considered for the development ofinformation storage technologies based on heat-assisted magnetic recording(HAMR). A practical realization of HAMR requires understanding thehigh-temperature phase transition behavior of FePt, including criticalexponents and Curie temperature distributions as the fundamental HAMR mediadesign characteristics. The studies so far found a significant degree ofvariability in the values of critical exponents of FePt and remaincontroversial. Here we show that at the heart of this variability is the phasetransition crossover phenomenon induced by two-ion anisotropy of FePt. ThroughMonte-Carlo simulations based on a realistic FePt effective Hamiltonian wedemonstrate that in order to identify the critical exponents accurately, it isnecessary to base the analysis on field-dependent magnetization data. We havedeveloped a two-variable finite size scaling method that accounts for the fieldeffect. Through the use of this method, we show unambiguously that truecritical exponents of FePt are fully consistent with the three-dimensionalHeisenberg universality class.

Resolving anomalies in the critical exponents of FePt using finite-size scaling in magnetic fields