Exchange bias in a mixed metal oxide based magnetocaloric compound YFe0.5Cr0.5O3

Abstract

We report a detailed investigation of magnetization, magnetocaloric effect and exchange bias studies on a mixed metal oxide YFe 0.5 Cr 0.

Reversed exchange-bias effect associated with magnetization reversal in the weak ferrimagnet LuFe0.5Cr0.5O3

“…Revival of the interest in orthoferrites-orthochromites, first of all in YFe 1-x Cr x O 3 , in the last decade [20,[23][24][25][26] was stimulated by perspectives to find the magnetization reversal and EB effects, that are very promising in view of possible applications. Both effects have been recently reported for several ferrite-chromite systems such as YFe 0.5 Cr 0.5 O 3 [27,28], Y 1-x Ho x Fe 0.5 Cr 0.5 O 3 (x = 0, 0.05, 0.1) [29], LaCr 1-x Fe x O 3 (x = 0.4 to 0.6) [30], NdCr 1-x Fe x O 3 (x = 0.05−0.2) [31], and NdFe 0.5 Cr 0.5 O 3 [32], and were discussed in terms of competition between the DM interaction and single-ion magnetic anisotropy [27][28][29][30][31]. It should be noted, however, that in these publications hysteresis loops were recorded with very small values of maximal field H max of 5-10 kOe [27,28,30,31] and these curves do not show any reversible part, where the ascending and descending branches of the loops coincide, so they actually represent minor hysteresis loops.…”

“…Both effects have been recently reported for several ferrite-chromite systems such as YFe 0.5 Cr 0.5 O 3 [27,28], Y 1-x Ho x Fe 0.5 Cr 0.5 O 3 (x = 0, 0.05, 0.1) [29], LaCr 1-x Fe x O 3 (x = 0.4 to 0.6) [30], NdCr 1-x Fe x O 3 (x = 0.05−0.2) [31], and NdFe 0.5 Cr 0.5 O 3 [32], and were discussed in terms of competition between the DM interaction and single-ion magnetic anisotropy [27][28][29][30][31]. It should be noted, however, that in these publications hysteresis loops were recorded with very small values of maximal field H max of 5-10 kOe [27,28,30,31] and these curves do not show any reversible part, where the ascending and descending branches of the loops coincide, so they actually represent minor hysteresis loops. It is well known that such curves are naturally displaced from the origin which, however, is irrelevant to the exchange-bias phenomenon [33,34].…”

“…Let us compare the cooling field dependencies of H EB and M EB presented in Figs. 5(c) and 5(d) with those obtained recently for isostructural YFe 0.5 Cr 0.5 O 3 [27][28][29]. Unfortunately, a clear comparison is not conceivable, because of very different H EB vs H cool data of Refs.…”

“…Nevertheless, the H EB vs H cool dependencies were found to be very similar in both Lu and Y compounds when measured with H cool smaller than 5 kOe (see Ref. [28]) while they appear strongly different at higher H cool [29]. Moreover, the H EB in YFe 0.5 Cr 0.5 O 3 measured at different maximal field H max of 5 kOe [28] and 30 kOe [29] shows comparable values, implying a small minor loop effect.…”

“…Unfortunately, a clear comparison is not conceivable, because of very different H EB vs H cool data of Refs. [27,28], obtained using a low value of field H max = 5 kOe. Nevertheless, the H EB vs H cool dependencies were found to be very similar in both Lu and Y compounds when measured with H cool smaller than 5 kOe (see Ref.…”