Fig. 1
From: Characterizing G-type antiferromagnetism quantitatively with optical second harmonic generation
Antiferromagnetic-paramagnetic phase transition of BFO films probed by SHG. a, b SHG in a wide temperature range of BFO/SAO/STO films and BFO freestanding films, respectively. The insets in (a, b) are RA-SHG results of BFO/SAO/STO and freestanding BFO films at different temperatures, respectively. c Schematic diagram of the BFO pseudo-cubic unit cell and the antiferromagnetic-paramagnetic phase transition. d, e Theoretical fitting results of RA-SHG results of BFO/SAO/STO films and freestanding BFO films at 350 K, respectively. f, g Theoretical fitting results of RA-SHG results of BFO/SAO/STO films and freestanding BFO films at 750 K, respectively. The hollow dots represent experimental data, the bule solid lines represent the contribution from the ferroelectric order, and the gray shaded areas represent the contribution from the antiferromagnetic order. h, i Temperature-dependent SHG signals contributed from antiferromagnetic order of BFO/SAO/STO films and BFO freestanding films extracted from RA-SHG measurements, respectively
