DocumentCode
1451119
Title
Magnetic Properties of La
Ca
MnO
https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1451119
 of La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub> of single magnetic domains. X-ray diffraction reveals a single phase La <sub>0.67</sub>Ca <sub>0.33</sub>MnO <sub>3</sub> of an orthorhombic crystal structure after heating the precursor at 600-1000degC for 2 h in air. At low temperature 10 K, as large coercivity H<sub>c</sub> as 411 Oe has been found in nanoplates processed at 600degC. As per a reasonably small value M<sub>s</sub> = 30.7 emu/g for the saturation magnetization, in a spin exchange coupled system, the magnetic spins in the shell order opposite to those in the core. The shell serves as a pinning barrier to support such high H<sub>c</sub> -value. First derivative of the thermomagnetic curve reveals a broad peak at ~ 254 K in the <i>T</i> <sub>C</sub> point. Upon raising the processing temperature to 800 or 1000degC, the M<sub>s</sub> improved markedly to 86.7 or 91.1 emu/g but the H<sub>c</sub>-value decreased to 143 or 36 Oe. A sharp <i>T</i> <sub>C</sub> point occurs around 268 K with a spin flipping near 40 K. Results are discussed in correlation to the observed microstructures.</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Keywords</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>X-ray diffraction; calcium compounds; coercive force; crystal structure; lanthanum compounds; magnetic domains; nanostructured materials; thermomagnetic effects; La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub>; X-ray diffraction; chemical method; coercivity; exchange coupled system; heating; magnetic domain; magnetic property; magnetic spin; microstructure; nanoplate material; orthorhombic crystal structure; pinning barrier; polyvinyl alcohol; saturation magnetization; size 15 nm to 35 nm; small polymer template; spin flipping; temperature 600 C to 1000 C; thermomagnetic curve; time 2 h; Ferromagnetic ceramics; GMR materials; half-metallic ferromagnets; magnetic properties;</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Journal_Title</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>Magnetics, IEEE Transactions on</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>ISSN</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>0018-9464</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>DOI</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>10.1109/TMAG.2009.2025511</div></div>
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