skip to main content

Title: The effect of annealing on the transformation and the microstructure of Mn{sub 1−x}Cr{sub x}CoGe alloys

In this work the effect of different thermal treatments on the transformation behavior of Mn{sub 1−x}Cr{sub x}CoGe alloys, with x = 0.15 and 0.20 has been analyzed. The changes in the transformation temperatures have been studied by differential scanning calorimetry (DSC). The results show that the structural transition temperature depends on the previous annealing. However, under the same heat treatment no significant change is observed on the transformation temperatures when replacing Mn by Cr. The microstructural evolution has been monitored using in-situ X-ray diffraction and transmission electron microscopy. The effect of an applied magnetic field on the transformation has been explored by SQUID magnetometry. Two different magnetic transitions are found: a first order paramagnetic (PM) to ferromagnetic (FM) corresponding to the transformation observed by calorimetry and a re-entrant spin glass to ferromagnetic transition. - Highlights: • The annealing conditions determine the magnetostructural transition. • A laminar microstructure along preferential planes observed by TEM • A RSG to ferromagnetic transition at low temperatures is detected.
Authors:
 [1] ;  [2] ;  [1] ; ;  [3] ;  [2] ;  [1]
  1. Departament de Física, Universitat de les Illes Balears, Cra. Valldemossa km 7.5, E-07122 Palma de Mallorca (Spain)
  2. Consiglio Nazionale delle Ricerche CNR—IENI, C.so P.Sposi 29, 23900 Lecco (Italy)
  3. Departamento de Física, Universidad Pública de Navarra, Campus de Arrosadía, E-31006 Pamplona (Spain)
Publication Date:
OSTI Identifier:
22340377
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 93; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; ANNEALING; CALORIMETRY; MAGNETIC FIELDS; MICROSTRUCTURE; PARAMAGNETISM; SPIN GLASS STATE; SQUID DEVICES; TRANSITION TEMPERATURE; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION