Influences of oxygen on the magnetocaloric properties of a Fe-based amorphous alloy

Magnetic properties and magnetocaloric effect in RE 55Co30Al10Si5 (RE = Er and Tm) amorphous ribbons

“…The −∆S max M values, at the ∆µ 0 H = 0 T-5 T, are determined to be 15.6 J/kg•K for Er 55 Co 30 Al 10 Si 5 and 15.7 J/kg•K for Tm 55 Co 30 Al 10 Si 5 , respectively, which are higher than that of most reported RE-based amorphous materials. [13][14][15][16][17][18][19][20][21][22][23][24][25][26] The positive ∆S max M value of Er 55 Co 30 Al 10 Si 5 at low temperature from 0 T-1 T may attribute to the spin glass behavior mentioned before. Moreover, it is worth noting that the −∆S M value of Er 55 Co 30 Al 10 Si 5 is considerable over a wide temperature range above the spinglass freezing temperature, making it still attractive within temperatures free from hysteresis effect.…”

“…[6][7][8][9][10][11][12] Amorphous alloys without boundaries and long-range order tend to exhibit attractive properties, such as corrosion resistance, adjustable phase transition temperatures, excellent RC, etc., which has attracted extensive attention, especially in magnetic refrigeration region. [13][14][15][16][17] Among them, rare earth (RE)-based amorphous materials are expected to exhibit excellent MCE attributed to the large magnetic moments (µ B ) and total angular momentum quantum number (J) of RE ions. However, most of the RE-based amorphous materials usually show low −∆S max M values despite their large RC, which restricts their application.…”

Anisotropic Metamagnetic Spin Reorientation and Rotational Magnetocaloric Effect of Single Crystal NdAlGe

“…From the thermodynamic Maxwell relations, the first-order magnetic transition (FOMT) is critical to high MCE performance and the second-order magnetic transition (SOMT) is beneficial to significant entropy change over a wide temperature range [ 22 , 23 ]. So, we analyze the magnetic transition analysis in terms of Arrott plot [ 20 ].…”