Determination of the critical exponent gamma from AC susceptibility measurements on amorphous ferromagnetic alloys

Kaul, S. N.; Hofmann, A.; Kronmüller, H.

doi:10.1088/0305-4608/16/3/014

Cited by 40 publications

(17 citation statements)

References 28 publications

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“…However, the values of g determined in the present work are in close agreement with those previously determined for Fe and Ni as well as the theoretical value for the three-dimensional Heisenberg model. The exponent value obtained in the present investigation is quite consistent with the values reported on similar amorphous alloys [24]. It is known that the substitution of early transition metals (Cr, Mn, Zr) in Fe-metalloid glasses makes them weakly magnetic and this reduction in magnetic nature can be interpreted as an increase of the antiferromagnetic interactions [13].…”

Section: Resultssupporting

confidence: 92%

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

Perumal¹,

Srinivas²,

Dhar³

et al. 2000

phys. stat. sol. (a)

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The temperature dependence of the ac susceptibility of amorphous Fe 90Àx Mn x Zr 10 (x 0, 4, 8) has been measured at different ac fields in the frequency range of 80 Hz to 1 kHz. All the compositions of the present study exhibit a double magnetic transition below room temperature. It is found that the Curie temperature T C decreases while the spin-glass transition temperature T f increases as Mn concentration increases from 0 to 8 at%. The values of T C and critical exponent associated with the magnetic susceptibility were extracted from ac susceptibility measurements. The critical exponent is in close agreement with the value predicted by the three-dimensional Heisenberg model. The results obtained here can be explained on the basis of competing exchange interactions below the magnetic ordering temperature.

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Section: Resultssupporting

confidence: 92%

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

Perumal¹,

Srinivas²,

Dhar³

et al. 2000

phys. stat. sol. (a)

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“…Moreover , most of the previous experimental works on nonlinear susceptibility in long range order systems are predominantly qualitative and not quantitative in nature. As far as the study of phase transitions is concerned, though the second order paramagnetic to ferromagnetic phase transition has been extensively studied using linear susceptibility [10]; the behavior of χ 3 across the transition has been relatively less explored.…”

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confidence: 99%

Probing a ferromagnetic critical regime using nonlinear susceptibility

Nair

Banerjee

2003

Phys. Rev. B

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The second order para−ferromagnetic phase transition in a series of amorphous alloys (F e5Co50N i17−xCrxB16Si12) is investigated using nonlinear susceptibility. A simple molecular field treatment for the critical region shows that the third order suceptibility (χ3) diverges on both sides of the transition temperature, and changes sign at T C . This critical behaviour is observed experimentally in this series of amorphous ferromagnets, and the related assymptotic critical exponents are calculated. It is shown that using the proper scaling equations, all the exponents necessary for a complete characterization of the phase transition can be determined using linear and nonlinear susceptiblity measurements alone. Using meticulous nonlinear susceptibility measurements, it is shown that at times χ3 can be more sensitive than the linear susceptibility (χ1) in unravelling the magnetism of ferromagnetic spin systems. A new technique for accurately determining T C is discussed, which makes use of the functional form of χ3 in the critical region.

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“…We have circumvented this problem by using low field ac susceptibility measurements in the critical region to determine γ. Low field ac susceptibility is an extremely useful tool in the study of a para−ferro phase transition, as it enables us to directly determine the true initial susceptibility (χ 0 ), which otherwise has to be estimated from the extrapolation of data measured at high applied fields [17] which besides supressing effects like inhomogeniety in the sample can mask the true critical beahviour of the system. This is specially important in systems like the hole doped manganites where short range correlations are known to exist till temperatures as large as 2T C [18].…”

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confidence: 99%

Observation of three-dimensional Heisenberg-like ferromagnetism in single crystalLa0.875Sr0.125MnO
Nair
¹
,
Banerjee
²
,
Narlikar
³

et al. 2003
Phys. Rev. B
64
3
20
0
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We report measurements and analysis of the magnetic critical phenomena in a single crystal of La0.875Sr0.125MnO3. The critical exponents associated with the ferromagnetic transition have been determined from ac susceptibility and dc magnetisation data. Techniques like the Kouvel−Fischer plots, modified Arrots Plots and the critical isotherm analysis were used for this purpose. The values of the the exponents γ, β and δ obtained are found to match very well with those predicted for the 3D Heisenberg model. Our results are consistent with recent numerical calculations and suggest that though the double exchange interaction is driven by the motion of conduction electrons, the effective magnetic interaction near the transition is renormalized to a short range one.

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Determination of the critical exponent gamma from AC susceptibility measurements on amorphous ferromagnetic alloys

Cited by 40 publications

References 28 publications

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

Probing a ferromagnetic critical regime using nonlinear susceptibility

Observation of three-dimensional Heisenberg-like ferromagnetism in single crystalLa0.875Sr0.125MnO
Nair
¹
,
Banerjee
²
,
Narlikar
³

et al. 2003
Phys. Rev. B
64
3
20
0
View full text Add to dashboard Cite

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Determination of the critical exponent gamma from AC susceptibility measurements on amorphous ferromagnetic alloys

Cited by 40 publications

References 28 publications

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

Probing a ferromagnetic critical regime using nonlinear susceptibility

Observation of three-dimensional Heisenberg-like ferromagnetism in single crystalLa0.875Sr0.125MnONair1, Banerjee2, Narlikar3 et al. 2003Phys. Rev. B643200View full textAdd to dashboardCite

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Observation of three-dimensional Heisenberg-like ferromagnetism in single crystalLa0.875Sr0.125MnO
Nair
¹
,
Banerjee
²
,
Narlikar
³

et al. 2003
Phys. Rev. B
64
3
20
0
View full text Add to dashboard Cite