TY - JOUR
T1 - Spin Stiffness Constant of Half-metallic Ferrimagnet in Mn-based Heusler Alloys
AU - Umetsu, Rie Y.
AU - Kanomata, Takeshi
N1 - Funding Information:
This work was supported by Grant-in-Aids for challenging Exploratory Research and for Scientific Research from the Japan Society for the Promotion of Science (JSPS). Parts of this work were performed at the Center for Low Temperature Science, Institute for Materials Research, Tohoku University
Publisher Copyright:
© 2015 The Authors. Published by Elsevier B.V.
PY - 2015
Y1 - 2015
N2 - In order to investigate the spin stiffness constant, D, of Mn-based Heusler alloys with half-metallic density of states, magnetic measurements were properly carried out. The Curie temperature, TC, of Mn2VAl, Mn50V20Al30 and Mn2CoGa were 768, 738 and 740 K, respectively. The value of D was evaluated from the temperature, T, dependence of the spontaneous magnetization in each specimen below 150 K, where linear dependence of T 3/2 was observed. The D values for these materials were obtained to be 5.34, 4.38 and 5.67 meV·(nm)2 and significantly larger than that for Co-based Heusler alloys reported previously. The strong exchange interaction would be the reason that the Mn-based Heusler alloys indicate high TC even though they have not so large total magnetic moment comparing to that of Co-based Heusler alloys.
AB - In order to investigate the spin stiffness constant, D, of Mn-based Heusler alloys with half-metallic density of states, magnetic measurements were properly carried out. The Curie temperature, TC, of Mn2VAl, Mn50V20Al30 and Mn2CoGa were 768, 738 and 740 K, respectively. The value of D was evaluated from the temperature, T, dependence of the spontaneous magnetization in each specimen below 150 K, where linear dependence of T 3/2 was observed. The D values for these materials were obtained to be 5.34, 4.38 and 5.67 meV·(nm)2 and significantly larger than that for Co-based Heusler alloys reported previously. The strong exchange interaction would be the reason that the Mn-based Heusler alloys indicate high TC even though they have not so large total magnetic moment comparing to that of Co-based Heusler alloys.
KW - exchange interaction
KW - half-metal ferrimagnets
KW - spin stiffness constant
KW - spontaneous magnetization
KW - the Curie temperature
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U2 - 10.1016/j.phpro.2015.12.115
DO - 10.1016/j.phpro.2015.12.115
M3 - Conference article
AN - SCOPUS:84974687094
SN - 1875-3884
VL - 75
SP - 890
EP - 897
JO - Physics Procedia
JF - Physics Procedia
T2 - 20th International Conference on Magnetism, ICM 2015
Y2 - 5 July 2015 through 10 July 2015
ER -