Investigation of isothermal entropy change, relative cooling power, and refrigerant capacity of GdCoAl nanocomposite thin film by changing the Al ratio at low magnetic fields of 100 Oe and 1000 Oe

BAYER Ö., PAT S.

Surfaces and Interfaces, cilt.50, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 50
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1016/j.surfin.2024.104497
  • Dergi Adı: Surfaces and Interfaces
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: GdCoAl, Nanocomposite, Refrigerant capacity, Relative cooling power
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

There are two challenges with magnetocaloric materials (MCMs): the production of low-cost materials and the applicability of MCMs at low magnetic fields. Due to the abundance of Al, the effects of Al composition in GdCoAl nanocomposite thin film alloys were investigated by fabricating Gd19.60Co20.00Al60.40 and Gd38.62Co28.43Al32.95 alloys. Nanometric grains were seen in the surface images with different grain dimensions by changing the Al ratio. With an increase in the Al ratio, the Z-height dimension decreased. The grains were homogeneous and small for the ternary thin film with a high Al ratio. It was established that the alloy with a higher amount of Al had a higher Curie temperature at a lower (100 Oe) magnetic field; it performed worse when compared to the low Al ratio sample regarding RCP and RC due to the small full width at half maxima. However, Gd19.60Co20.00Al60.40 at a higher magnetic field intensity of 1000 Oe, performed better.