Effect of spin glass frustration on exchange bias in NiMn/CoFeB bilayers

Nayak, Sagarika; Manna, P. K.; Singh, Braj Bhusan; Bedanta, Subhankar

doi:10.1039/d0cp05726f

Cited by 13 publications

(7 citation statements)

References 44 publications

(46 reference statements)

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“…Recently Nayak et al showed that the NiMn/CoFeB possess spin glass like exotic properties at the interface. 31 In the same sample structure, we do show here that there is finite spin current propagation via spin pumping in the heterostructures. The spin pumping voltage reduces to ∼20% up to the NiMn thickness of 40 nm (S4) in comparison to S1.…”

Section: Resultssupporting

confidence: 62%

Spin dynamics and inverse spin Hall effect study in the metallic Pt/NiMn/CoFeB system

Roy

Nayak

Gupta

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Resultssupporting

confidence: 62%

Spin dynamics and inverse spin Hall effect study in the metallic Pt/NiMn/CoFeB system

Roy

Nayak

Gupta

et al. 2022

Phys. Chem. Chem. Phys.

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“…A similar phenomenological picture has also been put forward for other spin-glass systems, where the spin-glass interface or spin-glass state is dominant in modulating the magnitude and behavior of the EB effect [16,23,28,34,35,36,[42][43][44][45]. Most exchange bias fields are generally on the order of 0.01 to 0.1 T, as summarized in Fig.…”

Section: Discussionmentioning

confidence: 64%

Spin freezing induced giant exchange bias in a doped Hund’s metal

Wu,

Li,

Zhao

et al. 2024

Preprint

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Exchange bias (EB) is a fundamental phenomenon in widespread information technologies. However, a comprehensive understanding of its microscopic origin remains a great challenge. One key issue in the debate is the role of frustration and disorder in the EB mechanism, which motivates the exploration of the EB effect in spin glass (SG) systems. Here, in the SG state of Cr-doped Hund’s metal CsFe2As2, we discover a giant EB effect with a maximum bias field of ~ 2 Tesla, which is almost two orders of magnitude larger than that of traditional alloy SGs. Our results indicate that the giant EB effect should originate from the exchange interactions at the natural boundaries between the tunable ferromagnetic-like (FM) regions around the Cr dopants and the SG matrix, via which the FM spins are strongly pinned by the frozen spins in the SG matrix. In addition, the temperature-dependent and cooling-field-dependent EB behaviors could be interpreted well by the SG model with frustrated FM/SG boundaries, which provides an intuitive and explicit understanding of the impact of glassy parameters on the EB effect. All these results suggest that Hund’s metal or other correlated metals are promising directions for exploring the EB effect in the SG state.

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“…Such an exponential thermal decay is considered as a fingerprint of the fact that the origin of the H EB and H C is due to the existence of spin frustration; this was previously reported in other systems, including oxides and metals, such as LSMO/LaNiO 3 bilayers [ 18 ]; LSMO/SMO bilayers [ 1 , 19 ]; LSMO/SrIrO 3 (SIO) bilayers [ 15 ]; LSMO/SMO/LSMO trilayers [ 20 ]; La 1-x Ca x MnO 3 FM (x = 0.33)/AFM (0.67) multilayers [ 21 ]; FM/SG Ni/Ni 76 Mn 24 bilayers [ 22 ]; amorphous/crystalline NiFe 2 O 4 ferrite [ 23 ]; NiMn/CoFeB bilayers [ 24 ]; and Co/CuMn bilayers [ 11 ], where the interfacial spin-glass state plays an important role in the EB effect. Thus, the temperature dependence of H EB and H C can be fitted using the phenomenological formulas

and

, where

and

are the extrapolation of H EB and H C at zero temperature; T 1 and T 2 are constants.…”

Section: Resultsmentioning

confidence: 99%

Spin Glass State in Strained La2/3Ca1/3MnO3 Thin Films

et al. 2022

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Epitaxial strain modifies the physical properties of thin films deposited on single-crystal substrates. In a previous work, we demonstrated that in the case of La2/3Ca1/3MnO3 thin films the strain induced by the substrate can produce the segregation of a non-ferromagnetic layer (NFL) at the top surface of ferromagnetic epitaxial La2/3Ca1/3MnO3 for a critical value of the tetragonality τ, defined as τ = |c − a|a, of τC ≈ 0.024. Although preliminary analysis suggested its antiferromagnetic nature, to date a complete characterization of the magnetic state of such an NFL has not been performed. Here, we present a comprehensive magnetic characterization of the strain-induced segregated NFL. The field-cooled magnetic hysteresis loops exhibit an exchange bias mechanism below T ≈ 80 K, which is well below the Curie temperature of the ferromagnetic La2/3Ca1/3MnO3 layer. The exchange bias and coercive fields decay exponentially with temperature, which is commonly accepted to describe spin-glass (SG) behavior. The signatures of slow dynamics were confirmed by slow spin relaxation over a wide temperature regime. Low-energy muon spectroscopy experiments directly evidence the slowing down of the magnetic moments below ~100 K in the NFL. The experimental results indicate the SG nature of the NFL. This SG state can be understood within the context of the competing ferromagnetic and antiferromagnetic interactions of similar energies.

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Effect of spin glass frustration on exchange bias in NiMn/CoFeB bilayers

Abstract: Exchange bias in ferromagnetic/antiferromagnetic systems can be explained in terms of various interfacial phenomena. Among these spin glass frustration can affect the magnetic properties in exchange bias systems. Here we...

Cited by 13 publications

References 44 publications

Spin dynamics and inverse spin Hall effect study in the metallic Pt/NiMn/CoFeB system

Spin dynamics and inverse spin Hall effect study in the metallic Pt/NiMn/CoFeB system

Spin freezing induced giant exchange bias in a doped Hund’s metal

Spin Glass State in Strained La2/3Ca1/3MnO3 Thin Films

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