02161nas a2200229   4500008004100000022001400041245016000055210006900215260000900284300001100293490000700304520132000311653001801631653002201649653002701671653002201698653002301720100001801743700002001761700001901781856013101800       2015                        eng d  a0022-372700aColossal increase in negative magnetization, exchange bias and coercivity in samarium chromite due to a strong coupling between Sm3+-Cr3+ spins sublattices0 aColossal increase in negative magnetization exchange bias and co  cJAN   a0250040 v483 a<p>We report giant temperature dependent negative magnetization (magnetization reversal) along with a large exchange bias and large coercivity in SmCrO3. The static magnetization measurements show the negative magnetization below similar to 192 K, due to competition between the external field, thermal activation energy and antiparallel Sm3+-Cr3+ spin interaction. At further lower temperatures, Sm3+ spins show an increased alignment due to the internal induced field of Cr3+ spins with minimum magnetization similar to - 0.037 emu g(-1). The temperature dependent exchange bias shows non-monotonic behavior. At 35 K, the exchange bias ceases to exist due to the orientation of Sm3+ moments with respect to canted Cr3+ moments. The crossover temperature decreases from similar to 191 K at 100 Oe to similar to 153 K at 250 Oe. The training effect further confirms the exchange bias in SmCrO3. The dynamic magnetization measurements exhibit anomalies around spin reorientation transition (T-SR similar to 34 K) and Neel transition (T-N similar to 192 K) which is consistent with static measurement and no frequency dependence was observed. The room temperature Raman spectra of SmCrO3 show peaks at similar to 364, similar to 375 and similar to 456 cm(-1) suggesting O-Cr-O bending modes within the octahedral.</p>10aexchange bias10amultiferroics etc10anegative magnetization10asamarium chromite10aspin reorientation1 aGupta, Preeti1 aBhargava, Richa1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/colossal-increase-negative-magnetization-exchange-bias-and-coercivity-samarium-chromite-due01671nas a2200229   4500008004100000022001400041245006500055210006500120260000800185300001100193490000800204520095300212653002301165653001801188653001901206653002801225653002401253100001901277700002301296700002501319856009701344       2022                        eng d  a0304-885300aControlled exchange bias behavior of manganese nanoparticles0 aControlled exchange bias behavior of manganese nanoparticles  cOCT  a1695040 v5593 a<p>
	Mn(0) colloids were synthesized by solvated metal atom dispersion approach utilizing hexadecylamine, toluene, and THF as coordinating ligands. Mn-toluene and Mn-THF nanoparticles were found to be highly pyrophoric in nature and demand careful handling whereas, Mn-HDA nanoparticles undergo slow oxidation. TEM micrographs revealed formation of nanoparticles between 3 and 6 nm. Magnetic studies of these three samples displayed shift in the field-cooled M-H hysteresis loop which has been attributed to exchange bias behavior. The exchange bias field, HE measured at 5 K varies with change in coordinating ligands around the Mn center which are 1217 Oe, 4408 Oe and, 6350 Oe for Mn-HDA, Mn-toluene and Mn-THF nanoparticles, respectively. The large exchange bias field has been attributed to the presence of uncompensated antiferromagnetic surface spins and the exchange interactions at the nanoparticle surface due to surface oxidation.</p>
10aAntiferromagnetism10aexchange bias10aFerromagnetism10aManganese nanoparticles10aUncompensated spins1 aTiwari, Garima1 aVinod, Prabhakaran1 aJagirdar, Balaji, R.  uhttps://library.ncl.res.in/content/controlled-exchange-bias-behavior-manganese-nanoparticles