Adiabatic Temperature Changes at Structural and Magnetic Phase Transitions in Ni45Mn43CoSn11 at High Magnetic Fields

The adiabatic temperature change (
$\Delta T_{\mathrm {ad}}$
) in Ni
₄₅
Mn
₄₃
CoSn
₁₁
has been measured by a direct method in magnetic field changes up to 14 T. Large reversible magnetocaloric effects resulting in
$\Delta T_{\mathrm {ad}}$
of about = −11 and 5 K have been observed for magnetic field changes of 14 T at the magnetostructural (
$T_{A} \sim 260$
K) and magnetic transitions (
$T_{C} \sim 320$
K), respectively. The impact of the thermomagnetic history on
$\Delta T_{\mathrm {ad}}$
at high magnetic fields has been reported. The significant observed changes in the relaxation time of
$\Delta T_{\mathrm {ad}}$
, depending on the type of the phase transitions, magnetization, and demagnetization cycle are discussed.