Engineering Physics Annotation << Back ORIENTATIONAL MAGNETIC PHASE TRANSITIONS IN THE RARE-EARTH INTERMETALLIC COMPOUND HO2 FE14B IN ULTRAHIGH MAGNETIC FIELDS Kostyuchenko N.V., Plokhov D.I., Dorofeev V.V., Kolyadenko M.D., Syomushkina E.N., Zvezdin A.K. The full magnetization process of the rare-earth intermetallic compound Ho2 Fe14B and its hydride Ho2 Fe14BH5,5 has been studied in an external magnetic fi eld of the megagauss range. These compounds, under the infl uence of the fi eld, transform from a state with ferrimagnetic ordering to a state with ferromagnetic ordering, and in a certain range of magnetic fi elds and temperatures a noncollinear phase is realized. Estimates of the critical fi elds of the orientational phase transitions are given, and the H-T phase diagram is obtained. Keywords: rare-earth intermetallic compounds, hydrogenation, high and ultra-high magnetic fi elds, magnetic phase transitions, full magnetization process, H – T phase diagrams Pp. 12-20.