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Effect of hydrazine on structural, morphological and magnetic properties of SmCo-Co nanocomposites
Kumari Kavita,Kumar Akshay,Park Su-Jeong,Sharma Mohit K.,Yadav Naveen,Kumar Manish,Kumar Shalendra,Huh Seok-Hwan,Kim Jong-Woo,Koo Bon-Heun 한국물리학회 2023 Current Applied Physics Vol.53 No.-
In the present work, one-dimensional (1-D) SmCo-Co magnetic nanocomposites are prepared in a single-pot chemical synthesis in the presence of external magnetic field with varying amounts of hydrazine hydrate with samples named as: SC-2 mL, SC-4 mL, SC-6 mL and SC-8 mL. The Rietveld refinement of XRD patterns revealed the formation of Sm2Co17 (P63/mmc), Sm(OH)3 (P63/m) and hcp-Co (P63/mmc) phases. The 1-D nanocomposites are found to possess the highest aspect ratio (~6.3), lowest crystallite size (~49 nm) and highest developed strain (~4.76 x 10-3) corresponding to SC-4 mL. The magnetic response of the samples is found to be affected by the hydrazine amount showing highest saturation magnetization (~156 emu/g) and effective magnetic anisotropy (~1.2 x 106 erg/cm3) for SC-4 mL with highest exchange coupling observed using Bloch law fitting. The results indicate suppressing behaviour of hydrazine amount to be utilized up to a certain limit.
Kumar Akshay,Vij Ankush,Huh Seok Hwan,Kim Jong-Woo,Sharma Mohit K.,Kumari Kavita,Yadav Naveen,Akram Fazli,구본흔 한국물리학회 2023 Current Applied Physics Vol.49 No.-
We investigated the influence of structural disorders on the magnetic and magnetocaloric (MC) properties upon A-site rare-earth substitution in A1.4Sr1.6Mn2O7 (A = La, Pr, Nd) Ruddlesden-Popper (R–P) compounds. The samples were produced through the solid-state method, and the structural analysis indicated formation of R–P phase with the Jahn-Teller distortion parameter varying from highest in La1.4Sr1.6Mn2O7 (LSMO) to Nd1.4Sr1.6Mn2O7 (NSMO) and followed by Pr1.4Sr1.6Mn2O7 (PSMO). Hence, the magnetization value was increased in LSMO sample implying an enhanced interbilayer and interlayer spin correlations. It resulted in a high value of MC parameters like temperature average entropy change (TEC) and relative cooling power (RCP) of 4.21 J/kgK and 87 J/kg for LSMO, while lowest value of 0.53 J/kgK and 27 J/kg for PSMO respectively, at 2.5 T field. The room temperature MC response in PSMO, whereas a large TEC in LSMO and NSMO compounds advocate their candidacy in broad range of refrigeration applications.