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We report on the strain-induced switch between ferromagnetic (FM) andantiferromagnetic (AFM) orderings in 1T-CrX2 (X = Se, Te) monolayers based onthe first-principles calculations. The CrSe2 and CrTe2 monolayers withoutstrains are found to be AFM and FM, respectively. Under the biaxial tensilestrain, the CrSe2 monolayer tends to be FM when the strain is larger than 2%.The FM state is further stabilized when the strain is increased. Moreover, theCrSe2 monolayer changes to be half-metallic when the tensile strain is largerthan 10%. While for the CrTe2 monolayer, the critical strain at which thetransition between the FM and AFM states occurs is compressive, of -1%.Relatively small tensile strains of 4% and 2%, respectively, can enhance theCurie temperature of CrSe2 and CrTe2 monolayers above the room temperature. Thestrain-induced switch between the FM and AFM states in CrSe2 (CrTe2) monolayercan be understood by the competition between the AFM Cr-Cr direct exchange andFM Cr-Se(Te)-Cr superexchange interactions. The tunable and attractive magneticand electronic properties controlled by the flexible strain are desirable forthe future nanoelectronic applications.

Strain-controlled switch between ferromagnetism and antiferromagnetism in 1T-CrX2 (X = Se, Te) monolayers