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  • 1
    Electronic Resource
    Electronic Resource
    Mapping of Magnetic Domains by MFM in Ni〈sub〉2〈/sub〉MnGa (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 52 (June 2008), p. 115-119 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Influence of structural transition in the evolution of the magnetic domains in theferromagnetic shape memory alloy system Ni2+xMn1-xGa is reported here using Magnetic ForceMicroscopy (MFM) studies. Studies reported are with two samples with their martensite transitiontemperature TM less than and greater than the Curie temperature Tc. Present results show anevolution of MFM across the Tc with a clear twin domains and sub domain structures inside thetwins. The higher spatial resolution of MFM (~50nm) as compared to optical microscope (400nm)is useful in probing the domain walls. Force derivative of the MFM signal that may be used as anorder parameter seems to scale the onset of magnetic order in the system. One can clearly see thevanishing of the MFM patterns for T〉Tc. Results are discussed in the light of models available fortip-sample interactions that track the local magnetization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.115.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Textural Ordering in NiTi, Ni-Fe-Ti, and Ni-Mn-Ga Shape Memory Alloys - Kinetics of Intra- and Inter-Domain Processes (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 52 (June 2008), p. 69-76 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A detailed kinetics study of the first-order structural transition in virgin NiTi, Ni47Fe3Ti50,and Ni2+xMn1-xGa (x= 0 and 0.26) manifests the varying role of renucleation-driven austeniticgrowth with the doping-induced disorder and the magnetization state. The austenite transitions wereinvestigated using differential scanning calorimeter (DSC) at heating rates spanning over a decade.They revealed the existence of two Arrhenius processes, with their relative presence, nucleationbarrierenergies, and validity-timescales suggesting that both intra- and inter-domain texturalorderingsundergo de-structuring. In the stoichiometric Ni2MnGa, a single low-energy barrier ( )fast kinetics observed may be attributed wholly to the short-distance textural order-disorder (a nearabsence of bigger, inter-domain interactions). On the other hand, two distinct Arrhenicities arefound in equal strength in NITINOL (NiTi) and Ni47Fe3Ti50, and in unequal proportion inNi2.26Mn0.74Ga, over the full range of temperature scanning rates covered (q= 2.5 to 50°C/min). Therelatively fast nucleation-driven growth dominates higher T-scanning rates, with lower barrieractivation (qhi) (albeit 〉 , due to a change in the twins’ character). Another kinetics with higherbarrier energy (qlo) manifests at slow heatings. The crossover in Ni47Fe3Ti50 is interpreted asincrease in the (disorder-induced) A-domain-size dispersion, which also causes a broadening of thetransition. Parameters characterizing the kinetics of various specimens are examined; comparisonsof the relative energy/time scales of inter- and intra-domain processes made, and theirtransition/crossover temperature discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.69.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Structural Studies on Mn Excess and Ga Deficient Ni-Mn-Ga (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 52 (June 2008), p. 109-114 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We report the structural studies on Mn excess and Ga deficient Ni2Mn1+zGa1-z specimenswith z= 0, 0.05, 0.1, 0.15, 0.2 and 0.25. The crystal structure at room temperature was determinedby the x-ray diffraction (XRD). Rietveld analysis has been performed to obtain the latticeparameters. For z= 0, 0.05 and 0.1, a cubic austenitic phase is observed. For 0.15≤ z ≤0.25, atetragonal martensitic phase is obtained, whose lattice constant c increases and a decreases linearlywith increasing z following Vegard’s law. Phase coexistence is observed for z= 0.15, confirming thefirst-order nature of the martensitic transition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.109.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    A Charge Compton Profile Study of Ni〈sub〉2〈/sub〉MnGa: Theory and Experiment (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 52 (June 2008), p. 181-186 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We present the first ever theoretical and experimental charge Compton profiles of Ni2MnGaHeusler alloy. The measurements have been made using magnetic Compton spectrometer atSPring8, Japan. The Compton profiles and energy bands have been computed using Hartree-Fock,density functional theory with local density and generalized gradient approximations. It is seen thatthe Hartree-Fock based Compton profile is relatively in better agreement with the experimentalprofiles. In addition, we also report the energy bands, density of states and valence charge densitiesusing full potential linearized augmented plane-wave method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.181.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Signature of Austenitic to Martensitic Phase Transition in Ni〈sub〉2〈/sub〉MnGa in Mn and Ni K-Edge XANES Spectra (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 52 (June 2008), p. 175-180 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The XANES studies at Mn, Ni and Ga K-edge of Ni2MnGa compound have been carriedout at room and low temperatures. The Mn K-edge and Ni K-edge spectra shows modulation in thepost edge features when the sample is cooled below martensitic transition temperature. It is stronglyreflected in the XANES of Mn K-edge where the peak after the edge gets totally suppressed whenthe sample is in martensitic phase. This peak shows a hysteretic behaviour when thermal cyclingwas done across the martensitic transition temperature. This clearly shows that the peak height is ameasure of austenitic phase present at a particular temperature. This demonstrates the strongcorrelations of electronic states and crystal structures in these compounds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.175.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Magneto-Transport and Magnetic Properties of Ni-Mn-Ga (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 52 (June 2008), p. 207-213 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We report a detailed investigation of the magneto-transport and magnetic properties ofMn excess Ni-Mn-Ga using the resistivity and magnetization measurements. Magnetoresistance(MR) has been measured in the ferromagnetic state for different compositions in the austenitic, premartensiticand martensitic phases. With Mn doping in Ni2-yMn1+yGa, a decrease in magnetizationand MR has been found, since the doped Mn atoms in Ni position are in the antiferromagneticconfiguration with the Mn atoms in Mn position. MR for the parent stoichiometric compositionNi2MnGa varies almost linearly with field in the austenitic and pre-martensitic phases, and shows acusp-like shape in the martensitic phase. This has been explained by the changes in twin and domainstructures in the martensitic phase. Hysteresis in the heating and cooling cycles is a characteristic ofthe first order nature of the martensitic phase transition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.52.207.pdf
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