TITLE

Magnetic properties of Sc-substituted ytterbium iron garnet under high dc field (33 Tesla)

AUTHOR(S)
Guillot, Maurice; Ostorero, Jean; Armstrong, Gordon; Fang Zhang; You Xu
PUB. DATE
May 2005
SOURCE
Journal of Applied Physics;5/15/2005, Vol. 97 Issue 10, p10F106-1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Magnetic measurements were performed on Yb3Fe5-xScxFe5O12(YbIG:Sc), x=0.5, single crystal platelets oriented along and perpendicular to the [111] crystallographic direction, in the 1.5-20 K temperature range in a magnetic field up to 330 kOe. Along the [110] and [100] axis H was limited to 230 kOe in the 4.2-300 K range. When H is parallel to [111] and [110] a first-order field induced transition are observed below about 10 K; the temperature variations of the transition field are very different. When H is applied along [100] a monotonous behavior is simply found. A noticeable anisotropy between the magnetic properties of the three samples remains present up to about 100 kOe. For the [111] sample the saturation is attained under 250 kOe below 10 K; the magnetic moment per Yb3+ ion that is deduced to be 1.78±0.05 Bohr magneton confirms the strong quenching of the orbital moment by the crystalline field. In the intermediary field range (≈100-220 kOe), there exists no more magnetic anisotropy. The magnetization that is proportional to the applied H is characterized by the onset of a field-induced magnetic structure; the Yb-Fe exchange constant is then determined. When H lies in the (111) plane, a strong M reduction is noted in the whole H domain; however, the transition field, the linear H Yb-Fe variation domain and the saturation field are the same as along the [111] direction.
ACCESSION #
98269304

 

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