• Yıldırım, Oğuz
• Bruno, N. M.
• Emre, Baris
• Yuce, S.

Abstract

<jats:title>Abstract</jats:title><jats:p>In this study, we examine Ni<jats:sub>49</jats:sub>Nb<jats:sub>1</jats:sub>Mn<jats:sub>36</jats:sub>In<jats:sub>14</jats:sub> (nom. at.%) magnetic shape memory alloy (MSMA) to illustrate the inverse magnetocaloric effect (MCE) using the fraction method. The magnetic entropy change, <jats:inline-formula><jats:tex-math><?CDATA $ {S_{{{mag}}}}$?></jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="normal">Δ</mml:mi><mml:mrow><mml:msub><mml:mi>S</mml:mi><mml:mrow><mml:mrow><mml:mtext>mag</mml:mtext></mml:mrow></mml:mrow></mml:msub></mml:mrow></mml:math><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cmacd3ceieqn1.gif" xlink:type="simple" /></jats:inline-formula>, was calculated with both, the fraction method and the thermomagnetic Maxwell relation. Our results demonstrate that there exists a large magnetization difference between field-cooling and field-heating histories in Ni<jats:sub>49</jats:sub>Nb<jats:sub>1</jats:sub>Mn<jats:sub>36</jats:sub>In<jats:sub>14</jats:sub> (nom. at.%) MSMA, which can be attributed to the pinning of lattice entropy and magnetic entropy, as it is well-known that the temperature and applied magnetic fields have an opposing effect on the total entropy change. In addition, we describe the inverse MCE and the contradictory roles on the total entropy change between the two stimuli via the fraction method.</jats:p>

Topics

• impedance spectroscopy
• magnetization