Magnetocaloric and Shape-Memory Properties in Magnetic Heusler Alloys

Planes A., Manosa L., Moya X., Marcos J., Acet M., Krenke T., ...Daha Fazla

International Conference on Ferromagnetic Shape Memory Alloys, Kolkata, Hindistan, 14 - 16 Kasım 2007, cilt.52, ss.221-222 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 52
  • Doi Numarası: 10.4028/www.scientific.net/amr.52.221
  • Basıldığı Şehir: Kolkata
  • Basıldığı Ülke: Hindistan
  • Sayfa Sayıları: ss.221-222
  • Anahtar Kelimeler: Magnetocaloric effect, shape-memory alloys, ferromagnetism, Heusler alloys, ENTROPY CHANGE, TRANSITIONS
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

In this paper, we discuss the. magnetocaloric behavior of Ni-Mn-based Heusler alloys in relation to their shape-memory and superelastic properties. We show that the magnetocaloric effect in these materials originates from two different contributions: (i) the coupling that is related to a strong uniaxial magnetic anisotropy and takes place at the length scale of martensite variants and magnetic domains (extrinsic effect), and (ii) the. intrinsic microscopic magnetostructural coupling. The first contribution is intimately related to the magnetically induced rearrangement of martensite variants (magnetic shape-memory) and controls the magnetocaloric effect at small applied fields, while the latter is dominant at higher fields and is essentially related to the possibility of magnetically inducing the martensitic. transition (magnetic superelasticity). The possibility of inverse magnetocaloric effect associated with these two contributions is also considered.