Hyperfine field and magnetic behavior of Heusler alloys

1979 ◽  
Vol 50 (B3) ◽  
pp. 2060-2062 ◽  
Author(s):  
Mary Beth Stearns
Keyword(s):  
Hyperfine Field ◽  
Heusler Alloys ◽  
Magnetic Behavior

Investigation of the magnetic hyperfine field at the Y site in the Heusler alloys (Y = Ti,V,Nb,Cr; Z = Al,Sn)

1996 ◽  
Vol 8 (50) ◽  
pp. 11317-11326 ◽  
Author(s):  
W Pendl ◽  
R N Saxena ◽  
A W Carbonari ◽  
J Mestnik Filho ◽  
J Schaff
Keyword(s):  
Hyperfine Field ◽  
Magnetic Hyperfine Field ◽  
Heusler Alloys ◽  
Magnetic Hyperfine

Hyperfine field at111Cd nuclei in Heusler Alloys

1978 ◽  
Vol 4 (1-2) ◽  
pp. 371-378 ◽  
Author(s):  
B. Styczeń ◽  
W. Waluś ◽  
A. Szytula
Keyword(s):  
Hyperfine Field ◽  
Heusler Alloys

Magnetic hyperfine field on Ta in the Co2HfAl and Co2HfGa Heusler alloys

1981 ◽  
Vol 9 (1-4) ◽  
pp. 489-493 ◽  
Author(s):  
R. da Silva ◽  
R. N. Saxena ◽  
J. Schaf ◽  
F. P. Livi ◽  
F. C. Zawislak
Keyword(s):  
Hyperfine Field ◽  
Magnetic Hyperfine Field ◽  
Heusler Alloys ◽  
Magnetic Hyperfine

Interaction of phase transformation and magneto- and elastocaloric properties of Heusler alloys

2013 ◽  
Vol 1581 ◽  
Author(s):  
Peter Entel ◽  
Vladimir V. Sokolovskiy ◽  
Vasiliy D. Buchelnikov ◽  
Denis Comtesse ◽  
Mehmet Acet
Keyword(s):  
Monte Carlo ◽  
Shape Memory ◽  
Ab Initio ◽  
Heusler Alloys ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
Experimental Investigations ◽  
Driving Mechanism ◽  
Magnetic Shape Memory ◽  
Magnetic Exchange

ABSTRACTThe structural, electronic and magnetic properties of functional Ni-Mn-(Ga, In, Sn) and Pt-Ni-(Ga, Sn) alloys are studied by first-principles and Monte Carlo tools. The ab initio calculations give a basic understanding of the underlying physics which is associated with the complex magnetic behavior arising from the competition of ferro- and antiferromagnetic interactions for excess Mn atoms in the unit cell. We show that the resulting complex magnetic ordering is the driving mechanism of structural transformations and multifunctional properties of Heusler alloys associated with magnetic shape-memory, magnetocaloric and elastocaloric effects. The thermodynamic properties can be calculated by using the ab initio magnetic exchange parameters in finite-temperature Monte Carlo simulations. Entropy and specific heat changes associated with the magnetic changes and emergence of microstructure across the magnetostructural transition are pointed out. We show how to optimize the functional properties by tuning the compositional changes, for example, a magnetic shape-memory effect of more than 14% can be achieved in Pt-Ni-Mn-Ga alloys. The theoretical studies are accompanied by experimental investigations.

Sn hyperfine field distributions in the Heusler alloys XMnSn and X2MnSn

1981 ◽  
Vol 59 (11) ◽  
pp. 1577-1584 ◽  
Author(s):  
R. A. Dunlap ◽  
R. H. March ◽  
G. Stroink
Keyword(s):  
Hyperfine Field ◽  
Fourier Expansion ◽  
Heusler Alloys ◽  
Expansion Method ◽  
Wide Distribution ◽  
Ordered Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Field Distributions ◽  
Hyperfine Field Distributions

The 119Sn hyperfine field in the Heusler alloys Ir1.07Mn1.07Sn0.86, PtMnSn, Ni2MnSn, Co2MnSn, and Pd2MnSn has been measured using the Mössbauer effect. Hyperfine field distributions were obtained from the Mössbauer spectra via the Fourier expansion method of Window. The spectra of Ni2MnSn, Co2MnSn, and Pd2MnSn showed a well-defined value of the hyperfine field. This indicates a well-ordered structure and is consistent with previous neutron diffraction and NMR measurements on these alloys. The Ir1.07Mn1.07Sn0.86 and PtMnSn spectra, on the other hand, showed a wide distribution of fields, indicating a considerable amount of disorder. The extent and type of disorder, as indicated by X-ray diffraction measurements, are also considered.

LOCAL MAGNETIC BEHAVIOR OF 54Fe in EuFe2As2 AND Eu0.5K0.5Fe2As2: MICROSCOPIC STUDY USING TIME DIFFERENTIAL PERTURBED ANGULAR DISTRIBUTION (TDPAD) SPECTROSCOPY

2013 ◽  
Vol 27 (31) ◽  
pp. 1350234
Author(s):  
S. K. MOHANTA ◽  
S. N. MISHRA ◽  
S. M. DAVANE ◽  
S. LAYEK ◽  
Z. HOSSAIN
Keyword(s):  
Angular Distribution ◽  
Hyperfine Field ◽  
Density Functional ◽  
Spin Fluctuation ◽  
Parent Compound ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
Orthorhombic Phase ◽  
Functional Theory ◽  
Time Differential

In this paper, we report the time differential perturbed angular distribution measurements of 54 Fe on a polycrystalline EuFe 2 As 2 and Eu 0.5 K 0.5 Fe 2 As 2. The hyperfine field and nuclear spin-relaxation rate are strongly temperature dependent in the paramagnetic state suggesting strong spin fluctuation in the parent compound. The local susceptibility show Curie–Weiss-like temperature dependence and Korringa-like relaxation in the tetragonal phase indicating the presence of local moment. In the orthorhombic phase, the hyperfine field behavior suggesting quasi two-dimensional magnetic ordering. The experimental results are in a good agreement with first-principle calculations based on density functional theory.

Sn hyperfine field systematics in Rh2MnZ Heusler alloys

1984 ◽  
Vol 62 (4) ◽  
pp. 396-399 ◽  
Author(s):  
R. A. Dunlap ◽  
S. Jha ◽  
G. M. Julian
Keyword(s):  
Mössbauer Spectroscopy ◽  
Hyperfine Field ◽  
Electron Density ◽  
Conduction Electron ◽  
Mossbauer Spectroscopy ◽  
Heusler Alloys ◽  
Hyperfine Fields ◽  
Mößbauer Spectroscopy ◽  
Theoretical Predictions ◽  
Conduction Electron Density

Sn hyperfine fields were measured using Mössbauer spectroscopy in the Heusler alloys Rh2MnZ (Z = Ge, Sn). The measurements yielded values of −48 and +31 kOe at 77 K for Sn in Rh2MnGe and Rh2MnSn, respectively. These values showed that in these alloys the Sn hyperfine field decreases with increasing conduction electron density. These results are compared with those obtained for Sn hyperfine fields in X2MnZ and Co2YZ Heusler alloys and are discussed in terms of theoretical predictions.

Sn hyperfine field trends in the Heusler alloys Co2Mn(Al, Si)

1983 ◽  
Vol 14 (3) ◽  
pp. 195-203 ◽  
Author(s):  
R. A. Dunlap ◽  
S. P. Ritcey
Keyword(s):  
Hyperfine Field ◽  
Heusler Alloys
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