In the present work all known factors contributing to the temperature dependence of the magnetic field induced strain (MFIS) in Ni–Mn–Ga martensite are considered in the framework of statistical model elaborated in [1,2]. These factors are the temperature dependencies of: (i) crystal lattice parameters [3], (ii) Young modulus [4], (iii) saturation magnetization and (iv) thermal fluctuations of the microstress. Both individual and cooperative effects of these factors on MFIS are studied. The effect of the factors (i) – (iv) on the achievable MFIS value and on the characteristic values of magnetic fields, which "switch on" and saturate MFIS, is estimated. It is shown, that all factors affect both the achievable MFIS value and characteristic fields under the real experimental conditions, none of them can be neglected during the quantitative theoretical analysis of the experimental strain–field dependencies obtained for the different temperature values. In addition, the influence of specimen’s shape on the characteristic fields is illustrated for different temperature values. For the available experimental dependencies (i) – (iii) and the reasonable set of model parameters the switching magnetic field proved to be equal to 160 kA/m when the temperature was 15 K below the martensite start temperature and to 320 kA/m when the temperature was 45 K below the martensite start temperature. Obtained results agree with the experimental data reported in [5]. References: [1] V.A. L’vov, O. Rudenko, N. Glavatska. Phys. Rev., B 71 (2005) 024421-6. [2] V.A. L’vov, N. Glavatska, I. Glavatskiy, Y. Ge, O. Heczko, O. Söderberg, S.-P. Hannula. Int. J. Appl. Electromagn. Mech., 23 (2006) 75-79. [3] N. Glavatska, I. Glavatskiy, G. Mogylny, S. Danilkin, D. Hohlwein, O. Söderberg, V. Lindroos and A. Beskrovnij. J. Phys. IV, 112 (2003) 963-967. [4] V. A. Chernenko, J. Pons, C. Seguí, E. Cesari. Acta Mater., 50 (2002) 53-60. [5] O. Heczko, L. Straka. J. Appl. Phys, 94 (2003) 7139.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/11225 must be provided.

1. Deformation of Ni–Mn–Ga martensite under the conditions of ultrasonic resonance
2. Time-dependent phenomena and thermal phonons in the Ni–Mn–Ga magnetic shape-memory alloys
3. DEPENDENCE OF THE MAGNETIC ANISOTROPY ON THE THICKNESS AND ANNEALING OF SPUTTER-DEPOSITED Ni-Mn-Ga THIN FILMS