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Nanto, Dwi,Akbar, Hamdan,Soegijono, Bambang,Kurniawan, Budhy,Ghosh, Nilopal,Hwang, Jong-Soon,Yu, Seong-Cho Elsevier 2017 PHYSICA B-CONDENSED MATTER - Vol.526 No.-
<P><B>Abstract</B></P> <P>In this work, we report magnetocaloric effect of Nb-doped on La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>Mn<SUB>1-<I>x</I> </SUB>Nb<SUB> <I>x</I> </SUB>O<SUB>3</SUB> (<I>x</I>=0, 0.002 and 0.01). Maximum magnetic entropy change under applied field of 10kOe obtained was –Δ<I>S</I> <SUB> <I>M</I> max</SUB> of 4.69Jkg<SUP>−1</SUP> K<SUP>−1</SUP>, 1.75Jkg<SUP>−1</SUP> K<SUP>−1</SUP> and 1.95Jkg<SUP>−1</SUP> K<SUP>−1</SUP> for <I>x</I>=0.0, 0.002 and 0.01, respectively. Total temperature span of both Nb-doped samples was 51K. A slight Nb-doped obtained a temperature span that went through the temperature span of the sample without Nb-doped, meanwhile more increasing Nb-doped might cause a little enhancement of maximum magnetic entropy change.</P>
Nanto, D.,Zhang Peng,Yong-Yeal Song,Seong-Cho Yu,Telegin, S.,Elochina, L.,Telegin, A. IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>Non-stoichiometric Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>MnO<SUB>3</SUB> (NSMO) single crystalline has been grown by the floating zone method. Their magnetic properties, magnetocaloric effect (MCE) and refrigerant capacity (<I>RC</I>) at near both first- and second-order phase transitions were investigated. The NSMO system goes through an antiferomagnetic charge-ordered transition at <I>T</I><SUB>CO</SUB> ~ 152 K followed by a ferromagnetic to paramagnetic transition at <I>T</I><SUB>C</SUB> ~ 272 K. The transition region spread over a broader temperature range at the <I>T</I><SUB>C</SUB> but it had a narrower temperature range at the <I>T</I><SUB>CO</SUB>. The maximum magnetic entropy change Δ<I>S</I><SUB>max</SUB> gives about 1.65 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP> at the first order magnetic transition and -1.13 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP> at the second order magnetic transition, respectively. <I>RC</I> is obtained and it shows much higher value about 34.85 J/kg at <I>T</I><SUB>C</SUB> than the <I>RC</I> 19.06 J/kg at <I>T</I><SUB>CO</SUB>. The slight non-stoichiometric NSMO single crystalline system raises the Curie temperature around 30 K towards room temperature without degradation of the <I>RC</I> and temperature span corresponding to the full width at half maximum of Δ<I>S</I><SUB>max</SUB>(Δ<I>T</I><SUB>FWHM</SUB>) compared to pure single crystalline NSMO system.</P>
Nanto, Dwi,Seong-Cho Yu,Suhk-Kun Oh,Chebotaev, Nikolay,Telegin, Andrey IEEE 2014 IEEE transactions on magnetics Vol.50 No.4
<P>Manganite perovskite with A-site deficiency has been synthesized by a solid-state reaction technique. Our work does not support a general view that A-site deficiency gives a decrease on Curie temperature. The Curie temperature of (La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>)<SUB>0.975</SUB>MnO<SUB>3.01</SUB> is 188 K with maximum entropy change -ΔSM <SUB>max</SUB> = 1.6 J·kg<SUP>-1</SUP>·K<SUP>-1</SUP> and refrigerant capacity (RC) of 27 J/kg under an applied field of 10 kOe. The nonstoichiometric (La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>)<SUB>0.975</SUB>MnO<SUB>3.01</SUB> may offer a wider temperature span of ~240% compared with those nanocrystalline La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>MnO<SUB>3.01</SUB> that have similar RC, which has been reported by others.</P>
Ginting, D.,Nanto, D.,Yu, S. C.,Phan, T. L. IEEE 2014 IEEE transactions on magnetics Vol.50 No.1
<P>The critical behavior around the paramagnetic-ferromagnetic phase transition in perovskite manganites Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Mn<SUB>1-x</SUB>Co<SUB>x</SUB>O<SUB>3</SUB>( x = 0.03 and 0.05) has been studied in detail by using various techniques, such as the modified Arrott plot and critical isotherm analysis. Basing on the modified Arrott plot method, we obtained the critical parameters of T<SUB>C</SUB> ≈ 234.3 K, β = 0.414 ±0.047 and γ = 1.488 ±0.312 for x = 0.03, and T<SUB>C</SUB> ≈ 221.9 K, β = 0.450 ±0.10 and γ = 1.113 ±0.033 for x = 0.05. The determined values of the critical exponents are in between those expected for the 3-D Heisenberg and mean-field models. With these values, isothermal magnetization data of the samples around T<SUB>C</SUB> fall into two branches of a universal function M(H, ε) = |ε|<SUP>β</SUP> f<SUB>±</SUB> (H/|ε|<SUP>β+ γ</SUP>), where ε = (T-T<SUB>C</SUB>)/T<SUB>C</SUB> is the reduced temperature, f<SUB>+</SUB> for T > T<SUB>C</SUB> and f for . This proves that the critical parameters determined are reliable and in accordance with the scaling hypothesis. Our results also demonstrate an existence of short-range ferromagnetic order in Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>Mn<SUB>1-x</SUB>Co<SUB>x</SUB>O<SUB>3</SUB>. Particularly, the Co doping at high concentrations has a tendency leading to long-range ferromagnetic order.</P>
Kontan Tarigan,송영열,유성초,Dwi Nanto 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Nanocrystalline Fe90−xMn10Alx (x = 10, 20, 30, and 40) were prepared via mechanical alloyingby using Fe, Mn, and Al powders with a 48 hours milling time. The structural and the magneticproperties were studied. All X-ray diffraction peaks are broader and shifted to smaller angle withincreasing Al contents, depending on the crystalline size and the lattice parameter. All the samplesexhibit alloys behavior with an average crystallite size around 10 nm. The magnetic saturation,coercivity, and permeability obtained from measurements using a vibrating sample magnetometershowed strong dependences on the Al content and these dependences were related to changes in thestructure and the crystallite size. The hyperfine field obtained from M¨ossbauer spectroscopy variedwith the Fe content. These results suggest that, by adjusting Al, appropriate magnetization valuescan be obtained without affecting the coercivity and the structure of the bcc phase.