Electronic structure and direct observation of ferrimagnetism in multiferroic hexagonal YbFeO3

Abstract

The magnetic interaction between rare-earth and Fe ions in hexagonal rare-earth ferrites (h-REFeO3), may amplify the weak ferromagnetic moment on Fe, making these materials more appealing as multiferroics. To elucidate the interaction strength between the rare-earth and Fe ions as well as the magnetic moment of the rare-earth ions, element specific magnetic characterization is needed. Using X-ray magnetic circular dichroism, we have studied the ferrimagnetism in h-YbFeO3 by measuring the magnetization of Fe and Yb separately. The results directly show anti-alignment of magnetization of Yb and Fe ions in h-YbFeO3 at low temperature, with an exchange field on Yb of about 17 kOe. The magnetic moment of Yb is about 1.6 µB at low-temperature, significantly reduced compared with the 4.5 µB moment of a free Yb 3+ . In addition, the saturation magnetization of Fe in h-YbFeO3 has a sizable enhancement compared with that in h-LuFeO3. These findings directly demonstrate that ferrimagnetic order exists in h-YbFeO3; they also account for the enhancement of magnetization and the reduction of coercivity in h-YbFeO3 compared with those in hLuFeO3 at low temperature, suggesting an important role for the rare-earth ions in tuning the multiferroic properties of h-REFeO3.2

Negative zero‐field‐cooled magnetization and magnetic switching in multiferroic Lu0.5Sc0.5FeO3 ceramics

“…While the size of Sc 3+ and Fe 3+ are close enough, there can be anti-site mixing where Fe 3+ goes to the R sites. If the moments of Fe 3+ on the R site tends to anti-align with those on the normal Fe sites as like in hexagonal YbFeO 3 , 48 the negative magnetization becomes possible. However, the negative magnetization is occurring only in the ZFC mode in LSFO.…”

Room‐temperature multiferroic characteristics and unique vortex domain structures of h‐Yb1−xInxFeO3 solid solutions

“…Yb 3+ in YbFeO 3 ceramics has lone-pair electrons, the super-exchange interaction between Yb 3+ and Fe 3+ may introduce more complicated magnetic structures and physics. 11,25 Therefore, it should be an important issue to investigate Yb 1−x In x FeO 3 system in order to get a deeper and general physical understanding on h-RFeO 3 ceramics. Moreover, though the topological vortex domains in hexagonal RFeO 3 / RMnO 3 thin films and single crystals have been well investigated, [26][27][28] the domain structure in hexagonal ceramics has been rarely reported and there are several issues to be figured out.…”

“…No references were found on modeling of the PIP process for CMCs, though experimental studies on this manufacturing process have been reported. Studies on polycarbosilanederived SiC ceramic 25 and SiC/SiC composite 26,27 have shown that porosity decreases and mechanical properties improve with the increasing number of PIP cycles. Zhu et al 28 show that increasing pyrolysis temperature and the concentration of SiC fillers in polycarbosilane polymer result in improved mechanical properties in two-dimensional Carbon/ SiC (C/SiC) composites fabricated using the PIP process.…”

“…No references were found on modeling for CMCs, though experimental studies o ing process have been reported. Studies o derived SiC ceramic 25 and SiC/SiC c shown that porosity decreases and mecha prove with the increasing number of PIP show that increasing pyrolysis temperatu tration of SiC fillers in polycarbosilane improved mechanical properties in two-d SiC (C/SiC) composites fabricated using Starting with pyrolysis of a "cured prepreg-based composite, each processin process involves infiltration of a precera porous ceramic preform followed by a py which the polymer is converted into ceram cess modeling is focused on these two ste Modeling of infiltration of liquids in well-studied subject, especially in the where it is used to model seepage of wa soils and rocks. 29,30 The physics of resin under pressure is similar to the seepage pr lar approaches have been used also to mod into a mold containing fiber mats.…”

Synthesis, structure, and visible-light-driven activity of o-YbFeO3/h-YbFeO3/CeO2 photocatalysts

“…Nanostructured ferrites, in particular REE orthoferrites (RFeO3, where R = Sc, Y, Ln), can be used as the basis for such materials. These compounds have been actively studied due to their practically significant structural [4], magnetic [5][6][7][8], electrical [8][9][10], conducting [11] and photocatalytic properties [12][13][14]. In particular, ytterbium orthoferrite YbFeO3 has important for practical applications electrical and magnetic properties that change depending on its crystal structure [15].…”