The magnetic structure of thulium orthoferrite, TmFeO3

The magnetic structure of the orthorhombic perovskite TmFeO3 has been studied between 1.6°K and room temperature by neutron diffraction measurements on powdered material. Above 94°K the iron moments are ordered in a G-type antiferromagnetic arrangement parallel to [100] with a slight cant producing a weak ferromagnetic component along [100]. Reorientation occurs between 94° and 81.5°K, below which the antiferromagnetic component is along [001]. No ordering of the thulium moments is observed down to 1.6°K. Maгнитнaя cтpyктypa opтopoMбиho ecy;cкoгo пepocкитa TmFeO3 былa иccлeпoBaнa Meждy I.6°К и кoM нaтнoй тeMпepaтypoй н& cпocoбoM нeйтpoнoгpaфиhecкич из;Mepний нa пyдpoBoM Maтepиaлe. Bышe 94°К жeлeзныe MoMe& ncy;ты yпopядoheнны B G- типoBoM aнтифeppoMaгнитнoM pacпo cy;лoжeнии пapaллeлныM к [100] c нeбoлъшиM нaклoнoM ycтaнaBли& vcy;aющиM cлaбый фeppo Maгнитный кoMпoнeкт пo [001]. peopиeнt cy;aция пpoиcчoдит Meждy 94°К и 81.5°К, нижe кoтopoй aнтифe& rcy;poMaгнитный кoMпoнeнт идeт пo [001]. yпopядoheниe ; тyлиeBыч кoMпoнeнтoB нe нaблюдaeтcя Bплoтъ дo 1.6°К.