Magnetic field-induced spatial spin reorientation in dysprosium orthoferrite

It is found that at low temperatures T ⩽ 5.5 K, a magnetic field H‖b induces spatial spin reorientation in dysprosium orthoferrite according to the pattern Г1, ⟶ Г1234 ⟶ Г4. The transition from the antiferromagnetic state Г1 to the state Г1234 with a spatial orientation of the ferro- and antiferromagnetism vectors is a second-order phase transition, while the transition from the state Г1234 to the weakly ferromagnetic state Г4 is a first-order phase transition.

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