Weak ferromagnetism and magnetization reversal in YFe _1−x Cr _x O ₃

Abstract

We present combined experimental and theoretical studies on the magnetic properties of a solid solution between yttrium orthoferrite and yttrium orthochromite systems, YFe1−xCrxO3 (0 ≤ x ≤ 1) where Fe 3+ and Cr 3+ ions are distributed randomly at the same crystallographic site (4b). We found that all the compositions exhibit weak ferromagnetism below the Néel temperature that decreases non-linearly with increasing x, while certain intermediate compositions (x = 0.4, 0.5) show a compensation point and magnetization reversal. This unusual behavior is explained based on a simple model comprising the isotropic superexchange and the antisymmetric Dzyaloshinskii-Moriya interactions. This model explains the magnetization behavior in the entire range of doping and temperature including the magnetization reversal which results from an interplay of various DM interactions such as, Fe-O-Fe, Cr-O-Cr and Fe-O-Cr.

Observation of ferroelectricity and magnetoelectric coupling in Mn-doped orthochromite DyCr 0.5 Mn 0.5 O 3

“…One of the members of the rare-earth orthochromite family, YCrO 3 does not exhibit dielectric anomaly or ferroelectric polarization at the magnetic transition. By introducing cation disorder at the Cr-site, Mao found weak ferromagnetism below the Ne´el M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT temperature (T N ) and high temperature multiferroicity in YFe 0.5 Cr 0.5 O 3 [9,10]. Later, Rajeswaran reported that RCr 0.6 Mn 0.4 O 3 (R= Y, La, Lu) exhibit ferroelectric polarization at T N [6].…”

Study of magnetization reversal in LaCr1−xFexO3 compounds

“…The experimental observations of exchange bias field in oxide coated cobalt and magnetization reversal in cobalt vanadate (IV) are known for a long time. 20,21 Recently, MR has been reported in several other systems such as Sr 2 RRuO 6 (R ¼ Yb, Y), 17,22,23 orthovanadates, 18,[24][25][26][27] orthoferrites, [28][29][30] orthochromites, [31][32][33][34][35][36][37][38][39][40][41] perovskite manganites, [42][43][44] and molecular magnets. [45][46][47] The mechanism of MR is found to be quite different in different systems.…”

Sign reversal of magnetization and tunable exchange bias field in NdCr1−xFexO3 (x=0.05–0.2)

“…Substitutions on rare earth site using other rare earth elements and on Cr site using other transition elements give rise to interesting properties like magnetization reversal (MR) and exchange bias (EB) phenomena. Even though MR is known to appear in ferrimagnetic (FIM) compounds [7], recently many other compounds such as Sr 2 YbRuO 6 [8], orthochromites [5,[9][10][11][12][13][14][15][16][17][18][19][20][21], orthoferrites [22][23][24], othovanadates [25,26], molecular magnets [27,28] and intermetallic alloys [29,30] are shown to exhibit such behavior. Exchange bias phenomenon has been studied in heterostructure of bilayer/multilayer thin films of AFM/FM, AFM/FIM (ferrimagnetic), AFM/SG (spin glass), etc.…”