Superparamagnetism and superspin glass behaviors in multiferroic NiMn‐based magnetic shape memory alloys

Cong, Daoyong; Roth, S.; Wang, Y. D.

doi:10.1002/pssb.201350355

Cited by 27 publications

(24 citation statements)

References 60 publications

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“…Founded in frustration and randomness of isolated moments a study of the functional properties of disordered alloys [15][16][17][18][19][20] grew in the hope of understanding their formation, magnetic ordering and the long range RKKY interactions between them 8 . Among the existing geometrically frustrated 3d transition metal based antiperovskite compounds displaying a fascinating array of properties ranging from giant magnetoresistance 21,22 to a large magnetocaloric effect (MCE) [23][24][25] 1 exhibits a transition from an enhanced paramagnetic state to an AFM state at ∼155…”

Section: Introductionmentioning

confidence: 99%

Phase-separated magnetic ground state in Mn3Ga0.45Sn0.55C

et al. 2017

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Existence of non-ergodic ground states is considered as a precursor to a first order long range magnetostructural transformation. Mn 3 Ga 0.45 Sn 0.55 C lies compositionally between two compounds, Mn 3 GaC and Mn 3 SnC, undergoing first order magnetic transformation. Mn 3 Ga 0.45 Sn 0.55 C though crystallizes in single phase cubic structure, exhibits more than one long range magnetic transitions.Using a combination of magnetization, ac susceptibility, neutron diffraction and XAFS techniques it is shown that, though Mn 3 Ga 0.45 Sn 0.55 C exhibits long range magnetic order, it presents a cluster glassy ground state due to formation of magnetically ordered Ga rich and Sn rich clusters. The clusters are big enough to present signatures of long range magnetic order but are distributed in such way that it limits interactions between two clusters of the same type leading to a frozen magnetic state at low temperatures. The main reason for such a cluster glass state is the difference in local structure of Mn atoms that find themselves in Ga rich and Sn rich clusters.

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Section: Introductionmentioning

confidence: 99%

Phase-separated magnetic ground state in Mn3Ga0.45Sn0.55C

et al. 2017

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“…The T p for the as-cast alloy is determined from the maximum on the ZFC curve at 172 K, whereas in the case of the homogenized and thermally treated 1220WQ and 1070SLC alloys it is found at 132 K and 141 K, respectively. Below the T p a range of complex, intricate magnetic states are expected in typical MSMA, and these may include ferromagnetic, antiferromagnetic, superparamagnetic and spin glassy states [7,[14][15][16]. From the minimum of the FC dM/dT curve, the T M C has been found at 127 K for the as-cast alloy and at 116 K for both the 1220WQ and 1070SLC alloys.…”

Section: Magnetizationmentioning

confidence: 96%

“…ferromagnetic transformations have already been well discussed in the literature together with predicted evolution of DS MT [13]. Nonetheless, some controversy still remains in particular in relation to frustrated magnetic states of martensite, which are frequently unveiled in MSMA [14][15][16], and also in reference to intermittent ferromagnetism of austenite, meaning…”

Section: Mtmentioning

confidence: 99%

“…Simultaneously, the magnetic response of martensite appears altered in the wake of the thermal treatment [15-18, 20, 21]. Clearing these issues is worthwhile, given the widespread applicability of SHT to the control of, e.g., martensite structure [15,17] and of the overall functional performance of MSMA [22]. Thus, the present paper provides a thorough evaluation of the microstructure and magnetic properties in solutionized and slow-cooled Ni 49 Co 1 Mn 37.5 Sn 6.5 In 6 MSMA and discusses their bearing on the d DT and DS MT .…”

Section: Mtmentioning

confidence: 99%

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Microstructural origins of martensite stabilization in Ni49Co1Mn37.5Sn6.5In6 metamagnetic shape memory alloy

et al. 2018

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Ordering effects in the Ni 49 Co 1 Mn 37.5 Sn 6.5 In 6 alloy were studied by subjecting the alloy to annealing at 1220 K followed by water quenching and to subsequent annealing at 1070 K followed by slow cooling. Martensitic transformation temperature increases by 10 K owing to the slow cooling process, which further invites a change in the martensite structure: 6M ? 10M. Across the transformation, regardless of the heat treatment applied, austenite phase is paramagnetic and it transforms into a weakly magnetic martensite. Magnetic moment of martensite is boosted due to slow cooling (Dl M eff ¼ 1l B). Observed behaviours are associated with the changes in the degree of atomic ordering. Irrespective of the magnetic state of martensite, ordering process mitigates the transformation temperature most likely through the interaction with the free energy difference and through the influence of antiphase domains on the twinning stress.

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“…At present, there are many experimental studies of the effect of Co addition in Ni‐Mn‐based alloys on their magnetic and structural properties (for example see Refs. ). On the one hand, the both magnetization of austenite and magnetization change across the magnetostructural phase transition are found to increase with substitution of Ni by Co. Because of this the better magnetocaloric properties are observed.…”

Section: Introductionmentioning

confidence: 97%

Monte Carlo Simulations of Thermal Hysteresis in Ni‐Mn‐Based Heusler Alloys

Sokolovskiy

Загребин

Entel

2017

Physica Status Solidi (b)

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We present a study of the thermal hysteresis that takes place across the magnetostructural phase transition of the Ni-Mn-based Heusler alloys. The results have been obtained by means of first-principles calculations and Monte Carlo simulations based on the proposed Potts-Blume-Emery-Griffiths Hamiltonian involving magnetic and elastic degrees of freedom. First, separating the structural and magnetic contributions, we calculate the phase diagram including the martensitic transformation as a function of ratio between exchange structural constants in martensite and austenite (K/J). It is shown that the width of the thermal hysteresis depends on K/J and it is found to increase at a ratio of K/J between 0.20 and 0.37. A similar trend is also observed for the Landau free energy expansion. The evolutions of the magnetization and deformation order parameter of alloys studied under various applied magnetic fields are simulated as functions of temperature upon heating and cooling cycles. Furthermore, under high applied fields the nonlinear shift of dT m =dH ext and change of hysteresis width according to the relation between magnetostructural interaction constants (U 1 and U 2 ) are observed. The results obtained with the Monte Carlo routine are discussed and demonstrated a good agreement with experimental data.

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Superparamagnetism and superspin glass behaviors in multiferroic NiMn‐based magnetic shape memory alloys

Cited by 27 publications

References 60 publications

Phase-separated magnetic ground state in Mn3Ga0.45Sn0.55C

Phase-separated magnetic ground state in Mn3Ga0.45Sn0.55C

Microstructural origins of martensite stabilization in Ni49Co1Mn37.5Sn6.5In6 metamagnetic shape memory alloy

Monte Carlo Simulations of Thermal Hysteresis in Ni‐Mn‐Based Heusler Alloys

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