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The origin of the metamagnetic antiferromagnetic-ferromagnetic phasetransition of FeRh is a subject of much debate. Competing explanations invokemagnetovolume effects and purely ther- modynamic transitions within the spinsystem. It is experimentally difficult to observe the changes in the magneticsystem and the lattice simultaneously, leading to differing conclusions overwhich mechanism is responsible for the phase transition. A non-collinearelectronic structure study by Mryasov [O.N. Mryasov, Phase Transitions 78, 197(2005)] showed that non-linear behavior of the Rh moment leads to higher orderexchange terms in FeRh. Using atomistic spin dynamics (ASD) we demonstrate thatthe phase transition can occur due to the competition between bilinear and thehigher order four spin exchange terms in an effective spin Hamiltonian. Thephase transition we see is of first order and shows thermal hysteresis inagreement with experimental observations. Simulating sub-picosecond laserheating we show an agreement with pump-probe experiments with a ferromagneticresponse on a picosecond timescale.

Higher order exchange interactions leading to metamagnetism in FeRh