Eur. Phys. J. Plus (2019) 134: 227
https://doi.org/10.1140/epjp/i2019-12751-6

Regular Article

Thermomagnetic properties of La_0.67Sr_0.33MnO₃ nanofibers

¹ Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
² Physics Department, Faculty of Science, Tanta University, Tanta, Egypt
³ Physics and Chemistry Department, Faculty of Education, Matrouh University, Matrouh, Egypt
⁴ High Institute of Engineering and Technology, King Marriott Academy, Alexandria, Egypt
⁵ Applied Organic Chemistry Department, National Research Centre, Dokki, 12622, Cairo, Egypt

^* e-mail: m_hamad76@yahoo.com

Received: 7 December 2018
Accepted: 27 February 2019
Published online: 27 May 2019

Abstract

The magnetocaloric effect (MCE) of La_0.67Sr_0.33MnO₃ (LSMO) nanofibers (NFs) is analyzed using a phenomenological model. It is concluded that a low magnetic field change ( H determines the shape of magnetic entropy change curves. This directly has an effect on the values of specific heat, relative cooling power and temperature changes. Therefore, H is an effective control of MCE for the LSMO NFs. Consequently, the LSMO NFs are useful as practical refrigerant materials working in relatively low H. This advantage makes the LSMO NFs potentially practical refrigerant materials for efficient cooling devices. In addition, the MCE of LSMO NFs is significantly larger and comparable with the MCE of other materials like Ge_0.95Mn_0.05, La_1-xCd_xMnO₃, and Gd_1-xCa_xBaCo₂O_5.5.