Spin-glass domain model for the reentrant state of Ni-Mn

Kouvel, J. S.; Abdul-Razzaq, W.

doi:10.1016/0304-8853(85)90142-8

Cited by 25 publications

(9 citation statements)

References 7 publications

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“…Thus, the EB effect has been reported in mixed Laves phase compounds RAl 2 (R = Nd, Ho, Gd, etc.) [13,14] and binary alloys, such as Ni-Mn [15], Fe-Mn [16], and Mn rich Heusler alloys [17,18,19].…”

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confidence: 99%

Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Fertman

Dolya

Desnenko

et al. 2014

Journal of Applied Physics

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Exchange bias (EB) phenomena have been observed in Nd 2/3 Ca 1/3 MnO 3 colossal magnetoresistance perovskite below the Curie temperature T C ~ 70 K and attributed to an antiferromagnetic (AFM) -ferromagnetic (FM) spontaneous phase segregated state of this compound. Field cooled magnetic hysteresis loops exhibit shifts toward negative direction of the magnetic field axis. The values of exchange field H EB and coercivity H C are found to be strongly dependent of temperature and strength of the cooling magnetic field H cool . These effects are attributed to evolution of the FM phase content and a size of FM clusters. A contribution to the total magnetization of the system due to the FM phase has been evaluated. The exchange bias effect decreases with increasing temperature up to T C and vanishes above this temperature with disappearance of FM phase.Relaxation of a non-equilibrium magnetic state of the compound manifests itself through a training effect also observed while studying EB in Nd 2/3 Ca 1/3 MnO 3 .

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confidence: 99%

Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Fertman

Dolya

Desnenko

et al. 2014

Journal of Applied Physics

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“…This is consistent with the domain-anisotropy model, which has provided a macroscopic explanation of the magnetic behavior of the NiMn system. 13 In addition, we found that the field integral, proportional to the amplitude of mean local magnetic induction in the magnetic medium, showed a two-stage increase as the temperature was lowered; i.e., the gradient of the temperature-dependent field integral significantly changed around the reentrant spin-glass temperature T RSG . 12 This feature contrasts with the observation of the field integral in conventional reentrant ferromagnets, in which it shows a broad peak around T RSG and successively shows a slow drop at lower temperatures.…”

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confidence: 97%

Spin freezing process in a reentrant ferromagnet studied by neutron depolarization analysis

et al. 2004

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The spin freezing process and the magnetic nature of reentrant spin-glass (RSG) and the ferromagnetic (FM) phases of a typical reentrant ferromagnet Ni 78 Mn 22 were investigated based on neutron depolarization analysis, and the results were compared with the previous Mössbauer measurements [Phys. Rev. B 64, 184432 (2001)]. The wavelength-dependent polarization, under a field cooled (FC) condition, showed the damped oscillatory behavior in both the RSG and FM phases, except in the temperature region just above the RSG temperature T RSG ϳ 60 K. At a temperature of around 80 K, however, it showed a double oscillatory behavior. The field integral I, which is proportional to the mean local magnetic induction, was deduced as a function of the temperature. Two branches of temperature-dependent field integrals were found: a low-temperature I low -branch, which has a small value of I, stopped at a temperature below the Curie temperature T C ϳ 160 K, and a high temperature I high -branch, which has a large value of I, appeared just below 80 K. This means that there are two kinds of magnetic environments, and they have different values of magnetization. This is consistent with the observation of the double peak spectrum of the hyperfine field in the previous Mössbauer measurements. The present neutron data and the Mössbauer data can be interpreted along a scenario of reentrant behavior, which consists of the low-temperature spin canting state and the "melting of frustrated spins" mechanism introduced by Saslow and Parker [Phys. Rev. Lett. 56, 1074], except for the absence of the observation of singularity in the temperature-dependent magnetization. Based on such considerations, we constructed a comprehensive picture of the spin freezing process and the magnetic nature of the RSG and FM phases in the reentrant ferromagnet.

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“…One of the most interesting phenomena in the RSG phase of this system is the field induced unidirectional anisotropy [2]. The origin has been theoretically explained by the DzyaloshinskyMoriya (D-M) type interaction through the RKKY interaction between Mn spins [3], although the intrinsic nature has been in a controversy.…”

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“…r Disordered Ni 100Àx Mn x alloy with xox c (B23.9) shows a transition from ferromagnetic phase to a mixed phase of ferromagnetic (FM) order and spin-glass correlation (reentrant spin-glass (RSG) phase) at the spin-freezing temperature [1]. One of the most interesting phenomena in the RSG phase of this system is the field induced unidirectional anisotropy [2]. The origin has been theoretically explained by the DzyaloshinskyMoriya (D-M) type interaction through the RKKY interaction between Mn spins [3], although the intrinsic nature has been in a controversy.…”

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confidence: 99%