Correlation of electronic structure and martensitic transition in epitaxialNi2MnGafilms
作者： G. Jakob , T. Eichhorn , M. Kallmayer , H. J. Elmers
DOI: 10.1103/PHYSREVB.76.174407
关键词: Magnetic circular dichroism 、 Condensed matter physics 、 Nuclear magnetic resonance 、 Magnetic anisotropy 、 Martensite 、 Electronic structure 、 Phase (matter) 、 Absorption spectroscopy 、 Materials science 、 Intermetallic 、 Austenite
摘要: We investigate the martensitic transition of single crystalline Ni2MnGa 110 /Al2O3 1120 and 100 /MgO films using magnetometry, x-ray diffraction, absorption spectroscopy, magnetic circular dichroism. The from cubic austenite phase to low symmetry martensite depends strongly on chosen substrate. For oriented Al2O3, is significantly more stable than for MgO. A remarkable change Ni spectra occurs at transition, indicating specific changes electronic structure. observed are in agreement with theoretical predictions. orbital spin momentum ratio moment increases entering state, thus explaining macroscopic increase anisotropy.
harvard.edu
magneticshape.de 参考文章(20)
M Kallmayer, H Schneider, G Jakob, H J Elmers, B Balke, S Cramm, Interface magnetization of ultrathin epitaxial Co2FeSi(110)/Al2O3 films Journal of Physics D. ,vol. 40, pp. 1552- 1557 ,(2007) , 10.1088/0022-3727/40/6/S07
M. Kallmayer, H. Schneider, G. Jakob, H. J. Elmers, K. Kroth, H. C. Kandpal, U. Stumm, S. Cramm, Reduction of surface magnetism of Co2Cr0.6Fe0.4Al Heusler alloy films Applied Physics Letters. ,vol. 88, pp. 072506- ,(2006) , 10.1063/1.2175486
G. Jakob, H.J. Elmers, Epitaxial films of the magnetic shape memory material Ni2MnGa Journal of Magnetism and Magnetic Materials. ,vol. 310, pp. 2779- 2781 ,(2007) , 10.1016/J.JMMM.2006.10.1046
G. Jakob, F. Casper, V. Beaumont, S. Falk, N. Auth, H.-J. Elmers, C. Felser, H. Adrian, Thin epitaxial films of the Heusler compound Co2Cr0.6Fe0.4Al Journal of Magnetism and Magnetic Materials. ,vol. 290, pp. 1104- 1107 ,(2005) , 10.1016/J.JMMM.2004.11.466
V. V. Martynov, V. V. Kokorin, The crystal structure of thermally- and stress-induced Martensites in Ni2MnGa single crystals Journal De Physique Iii. ,vol. 2, pp. 739- 749 ,(1992) , 10.1051/JP3:1992155
Alexei Sozinov, AA Likhachev, N Lanska, Kari Ullakko, None, Giant magnetic-field-induced strain in NiMnGa seven-layered martensitic phase Applied Physics Letters. ,vol. 80, pp. 1746- 1748 ,(2002) , 10.1063/1.1458075
V. V. Khovailo, V. Novosad, T. Takagi, D. A. Filippov, R. Z. Levitin, A. N. Vasil’ev, Magnetic properties and magnetostructural phase transitions in Ni 2 + x Mn 1 − x Ga shape memory alloys Physical Review B. ,vol. 70, pp. 174413- ,(2004) , 10.1103/PHYSREVB.70.174413
O Söderberg, Y Ge, A Sozinov, S-P Hannula, V K Lindroos, Recent breakthrough development of the magnetic shape memory effect in Ni–Mn–Ga alloys Smart Materials and Structures. ,vol. 14, pp. S223- S235 ,(2005) , 10.1088/0964-1726/14/5/009
P. J. Webster, K. R. A. Ziebeck, S. L. Town, M. S. Peak, Magnetic order and phase transformation in Ni2MnGa Philosophical Magazine Part B. ,vol. 49, pp. 295- 310 ,(1984) , 10.1080/13642817408246515
G van der Laan, I W Kirkman, The 2p absorption spectra of 3d transition metal compounds in tetrahedral and octahedral symmetry Journal of Physics: Condensed Matter. ,vol. 4, pp. 4189- 4204 ,(1992) , 10.1088/0953-8984/4/16/019