Article

Magnetocaloric effect in ribbon samples of Heusler alloys Ni–Mn–M (M = In,Sn)

Applied Physics Letters (Impact Factor: 3.52). 11/2010; 97(21):212505-212505-3. DOI: 10.1063/1.3521261
Source: arXiv

ABSTRACT Direct measurements of the magnetocaloric effect in samples of rapidly
quenched ribbons of Mn50Ni40In10 and Ni50Mn37Sn13 Heusler alloys, with
potential applications in magnetic refrigeration technology, are carried out.
The measurements were made by a precise method based on the measurement of the
oscillation amplitude of the temperature in the sample while is subjected to a
modulated magnetic field. In the studied compositions both direct and inverse
magnetocaloric effects associated with magnetic (paramagnet - ferromagnet -
antiferromagnet) and structural (austenite - martensite) phase transitions are
found. Additional inverse magnetocaloric effects of small value are observed
around the ferromagnetic transitions.

1 Bookmark
 · 
93 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: Two Mn-Ni-Fe-Ge ribbon samples are prepared. The ribbons reveal the complicated magnetization process with the variation of temperature and magnetic field. Strikingly, the antiferromagnetic-ferromagnetic conversion and competition are observed in the TiNiSi-type phase in these ribbons. The required field to complete the conversion decreases with increasing temperature. When completing conversion, the coupled magnetostructural transformation from the ferromagnetic TiNiSi-type to paramagnetic Ni2In-type state with large magnetic entropy changes near room temperature is achieved for these ribbons. However, it is found that the magnetic field would be difficult to drive ferromagnetic-paramagnetic magnetostructural transformation for these ribbons unlike temperature.
    Applied Physics Letters 05/2014; 104(20):202412-202412-5. DOI:10.1063/1.4879804 · 3.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Room temperature magnetic refrigeration is an energy saving and environmentally-friendly technology, which has developed rapidly from a basic idea to prototype devices. The performance of magnetic refrigerators crucially depends on the magnetocaloric properties and the geometry of the employed refrigerants. Here we review the magnetocaloric properties of Heusler alloys and related compounds with a high surface to volume ratio such as films, ribbons, and microwires, and compare them with their bulk counterparts.
    physica status solidi (b) 10/2014; 251(10). DOI:10.1002/pssb.201451217 · 1.61 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: An experimental setup, based on a non-contact temperature sensor, is proposed to directly measure the magnetocaloric effect of samples few micrometers thick. The measurement of the adiabatic temperature change of foils and ribbons is fundamental to design innovative devices based on magnetocaloric thin materials or micro-structuring bulk samples. The reliability of the proposed setup is demonstrated by comparing the measurements performed on a bulk gadolinium sample with the results obtained by an experimental setup based on a Cernox bare chip thermoresistance and by in-field differential scanning calorimetry. We show that this technique can measure the adiabatic temperature variation on gadolinium sheets as thin as 27 μm. Heat transfer simulations are added to describe the capability of the presented technique.
    Review of Scientific Instruments 07/2014; 85(7):074902-074902-6. DOI:10.1063/1.4890394 · 1.58 Impact Factor

Full-text (2 Sources)

Download
60 Downloads
Available from
May 19, 2014