Asymmetric double-shifted characteristics in epitaxial (002) exchange-biased IrMn/CoFe bilayers

Huang, Hsin-Hung; Yang, Chih-Yen; Lin, Hsin-Yi; Lai, Chih‐Huang

doi:10.1063/1.3554384

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…The occurrences of double shifted hysteresis loops imply that there may exist two competitive exchange interactions between FM and AFM spins in FM spin rotation process, give us an opportunity to study the relation between EB and the microscopic domain structure. Similar results have been found in the most studied FM/AFM bilayers, [20][21][22][23] in which negative shifted, positive shifted and double-shifted loop can also be tunable by thermal activation and change of cooling field. The origin is attributed to the coexistence of two types of AFM domains with opposite oriented directions at the interface, and H EB depends on the relative size of the two AFM domains with opposite EB sign.…”

Section: Resultssupporting

confidence: 84%

“…The origin is attributed to the coexistence of two types of AFM domains with opposite oriented directions at the interface, and H EB depends on the relative size of the two AFM domains with opposite EB sign. [20][21][22][23][24] Though the bidomain model has been widely studied in FM/AFM bilayers, it was seldom employed to interpret microscopic domain structure in Ni-Mn based FSMAs. In our opinion, the bidomain model can be used to explain our results intuitively.…”

Section: Resultsmentioning

confidence: 99%

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Effect of thermal cycle on the interfacial antiferromagnetic spin configuration and exchange bias in Ni-Mn-Sb alloy

Wang

Lee

et al. 2012

AIP Advances

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Effect of thermal cycle on the interfacial antiferromagnetic (AFM) spin configuration and exchange bias in Ni50Mn36Sb14 alloy has been investigated. The results indicate thermal cycle can induce further martensitic transition from part of arrested FM phase to AFM phase, leading to the reconstruction of interfacial antiferromagnetic spin configuration. The shape of hysteresis loops at 5 K after cooling back can be tuned from a single-shifted loop to a nearly symmetric double-shifted loop gradually accompanied with exchange bias field increasing to peak value and then decreasing. The evolutions can be illustrated intuitively by a simple AFM bidomain model

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Effect of thermal cycle on the interfacial antiferromagnetic spin configuration and exchange bias in Ni-Mn-Sb alloy

Wang

Lee

et al. 2012

AIP Advances

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“…Those two magnetic anisotropies may stem from two interfacial energies as in exchange-biased multilayer systems. [36][37][38][39] However, it is not likely the case in our films which consist of only one FM/AF interface. Moreover, as observed in Figs.…”

Section: Methodsmentioning

confidence: 88%

Strain-driven fractional spontaneous exchange bias in ferromagnetic/antiferromagnetic thin films with composition-graded ferromagnetic layer

Phuoc

Ong

2014

Journal of Applied Physics

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We experimentally demonstrate that the stress-induced magnetic anisotropy in composition-graded ferromagnetic NiFeTa layers can be employed to trigger exchange bias in NiFeTa/IrMn bilayers without using any deposition field or field cooling procedure. In particular, we found that the NiFeTa/IrMn bilayers exhibit double-shifted loops being composed of both negative and positive exchange biases when the deposition angle is low. As the deposition angle is increased, the magnetization curves change into a single-shifted loop with spontaneous exchange bias aligned along negative or positive direction. The results can be explained by the formation of magnetic domain state under the presence of a strong stress-induced magnetic anisotropy and this domain state is pinned upon the deposition of an antiferromagnetic layer. We also studied the dynamic permeability spectra of the films with respect to temperature and discussed the results in relation with the static magnetic properties.

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“…The interplay between F magnetocrystalline anisotropy and EB has been reported in several epitaxial systems. Generally, one would expect magnetization reversal characteristics such as stepped hysteresis loop and reversal asymmetry [183,196], which are attributed to the complex configuration of multiple easy axes [32,197,198].…”

Section: Ferromagnetic Magnetocrystalline Anisotropymentioning

confidence: 99%

Epitaxial exchange-bias systems: From fundamentals to future spin-orbitronics

Zhang

Krishnan

2016

Materials Science and Engineering: R: Reports

104

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Exchange bias has been investigated for more than half a century and several insightful reviews, published around the year 2000, have already summarized many key experimental and theoretical aspects related to this phenomenon. Since then, due to developments in thin-film fabrication and sophisticated characterization methods, exchange bias continues to show substantial advances; in particular, recent studies on epitaxial systems, which is the focus of this review, allow many long-standing mysteries of exchange bias to be unambiguously resolved. The advantage of epitaxial samples lies in the well-defined interface structures, larger coherence lengths, and competing magnetic anisotropies, which are often negligible in polycrystalline samples. Beginning with a discussion of the microscopic spin properties at the ferromagnetic/antiferromagnetic interface, we correlate the details of spin lattices with phenomenological anisotropies, and finally connect the two by introducing realistic measurement approaches and models.We conclude by providing a brief perspective on the future of exchange bias and related studies in the context of the rapidly evolving interest in antiferromagnetic spintronics.

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Asymmetric double-shifted characteristics in epitaxial (002) exchange-biased IrMn/CoFe bilayers

Cited by 8 publications

References 13 publications

Effect of thermal cycle on the interfacial antiferromagnetic spin configuration and exchange bias in Ni-Mn-Sb alloy

Effect of thermal cycle on the interfacial antiferromagnetic spin configuration and exchange bias in Ni-Mn-Sb alloy

Strain-driven fractional spontaneous exchange bias in ferromagnetic/antiferromagnetic thin films with composition-graded ferromagnetic layer

Epitaxial exchange-bias systems: From fundamentals to future spin-orbitronics

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