Sl. Gnatchenko et al., MAGNETIC-FIELD-INDUCED SPATIAL SPIN REORI ENTATION IN DYSPROSIUM ORTHOFERRITE, Fizika nizkih temperatur, 19(7), 1993, pp. 773-778
It has been revealed that a magnetic field H parallel-to b applied dys
prosium orthoferrite induces at low temperature T less-than-or-equal-t
o 5.5 K spatial spin reorientation GAMMA1 --> GAMMA1234 --> GAMMA4. Th
e transition from the antiferromagnetic state GAMMA1 to the state GAMM
A1234 with spatial orientation of ferro- and antiferromagnctic vectors
is a second-order phase transition and that from the state GAMMA1234
to the weak ferromagnetic one GAMMA4 is a first-order transition.