Microstructure and atomic configuration of the (001)-oriented surface of epitaxial Ni-Mn-Ga thin films

被引：25

作者：

Leicht, P. ^{[1
]}

Laptev, A. ^{[1
]}

Fonin, M. ^{[1
]}

Luo, Y. ^{[2
]}

Samwer, K. ^{[2
]}

机构：

[1] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany

[2] Univ Gottingen, Inst Phys 1, D-37077 Gottingen, Germany

来源：

NEW JOURNAL OF PHYSICS | 2011年 / 13卷

关键词：

NI2MNGA SINGLE-CRYSTALS; MARTENSITIC-TRANSFORMATION; ALLOYS; PHASE; MICROSCOPY;

D O I：

10.1088/1367-2630/13/3/033021

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The (001)-oriented surface of epitaxial off-stoichiometric Ni-Mn-Ga ferromagnetic shape memory alloys was studied in both austenitic and martensitic phases. Scanning tunneling microscopy (STM) imaging of the austenitic surface reveals a well-ordered and reconstruction-free surface exhibiting predominantly Mn-Ga termination. We found that only one of the two atomic species (Ga or Mn) is visible in STM, which is attributed to a pronounced geometric corrugation of the surface layer. After a transformation of the sample from the initial austenitic phase to the martensitic phase upon a high-temperature annealing step, a thorough investigation of the martensitic surface was conducted. On a larger scale, pronounced corrugation lines arise from the macroscopically twinned surface. A second corrugation feature is found on a distinctly smaller scale and is shown to originate from the modulated nature of the martensitic film structure. The irregularly spaced corrugation lines support the model of adaptive martensites.

引用

页数：14

共 26 条

[1] The crystal structure and phase transitions of the magnetic shape memory compound Ni2MnGa [J].

Brown, PJ ;

Crangle, J ;

Kanomata, T ;

Matsmuoto, M ;

Neumann, KU ;

Ouladdiaf, B ;

Ziebeck, KRA .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2002, 14 (43) :10159-10171

[2] In situ studies of the martensitic transformation in epitaxial Ni-Mn-Ga films [J].

Buschbeck, J. ;

Niemann, R. ;

Heczko, O. ;

Thomas, M. ;

Schultz, L. ;

Faehler, S. .

ACTA MATERIALIA, 2009, 57 (08) :2516-2526

[3] Photoemission study of the (100) surface of Ni2MnGa and Mn2NiGa ferromagnetic shape memory alloys [J].

Dhaka, R. S. ;

D'Souza, S. W. ;

Maniraj, M. ;

Chakrabarti, Aparna ;

Schlagel, D. L. ;

Lograsso, T. A. ;

Barman, S. R. .

SURFACE SCIENCE, 2009, 603 (13) :1999-2004

[4] Modelling the phase diagram of magnetic shape memory Heusler alloys [J].

Entel, P ;

Buchelnikov, VD ;

Khovailo, VV ;

Zayak, AT ;

Adeagbo, WA ;

Gruner, ME ;

Herper, HC ;

Wassermann, EF .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2006, 39 (05) :865-889

[5]

Fähler S, 2008, ACTUATOR, P754

[6] Crystal structure and macrotwin interface of five-layered martensite in Ni-Mn-Ga magnetic shape memory alloy [J].

Ge, Y. ;

Jiang, H. ;

Sozinov, A. ;

Soderberg, O. ;

Lanska, N. ;

Keranen, J. ;

Kauppinen, E. I. ;

Lindroos, V. K. ;

Hannula, S. -P. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 438 :961-964

[7]

Greenwood N. N., 2012, Chemistry of the Elements

[8] Adaptive Modulations of Martensites [J].

Kaufmann, S. ;

Roessler, U. K. ;

Heczko, O. ;

Wuttig, M. ;

Buschbeck, J. ;

Schultz, L. ;

Faehler, S. .

PHYSICAL REVIEW LETTERS, 2010, 104 (14)

[9] ADAPTIVE PHASE FORMATION IN MARTENSITIC-TRANSFORMATION [J].

KHACHATURYAN, AG ;

SHAPIRO, SM ;

SEMENOVSKAYA, S .

PHYSICAL REVIEW B, 1991, 43 (13) :10832-10843

[10] A fabrication technology for epitaxial Ni-Mn-Ga microactuators [J].

Khelfaoui, F. ;

Kohl, M. ;

Buschbeck, J. ;

Heczko, O. ;

Faehler, S. ;

Schultz, L. .

EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, 2008, 158 (1) :167-172

← 1 2 3 →