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We apply the first-order reversal curve (FORC) method, borrowed from studiesof ferromagnetic materials, to the magneto-structural phase transition of FeTe.FORC measurements reveal two features in the hysteretic phase transition, evenin samples where traditional temperature measurements display only a singletransition. For Fe1.13Te, the influence of magnetic field suggests that themain feature is primarily structural while a smaller, slightlyhigher-temperature transition is magnetic in origin. By contrast Fe1.03Te has asingle transition which shows a uniform response to magnetic field, indicatinga stronger coupling of the magnetic and structural phase transitions. We alsointroduce uniaxial stress, which spreads the distribution width withoutchanging the underlying energy barrier of the transformation. The work showshow FORC can help disentangle the roles of the magnetic and structural phasetransitions in FeTe.

First-Order Reversal Curves of the Magnetostructural Phase Transition in FeTe