Role of interface alloying in the exchange bias of Fe/Cr bilayers

Ali, Shamshad; Janjua, Muhammad Bilal; Fecioru-Morariu, Marian; Lott, D.; Smits, C.J.P.; Güntherodt, G.

doi:10.1103/physrevb.82.020402

Cited by 15 publications

(11 citation statements)

References 26 publications

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“…Especially, by using a canonical SG alloy (CuMn), Ali et al 21 first reported the sign-changeable behavior of T -dependent H E in SG/FM bilayer systems. Subsequently, Yuan et al 22 and Ali et al 23 observed the similar H E ∼ T trend in other SG materials (FeAu and FeCr). Without performing any H FC -dependent studies, they interpreted those abnormal T -dependent EB behaviors either in the framework of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction theory 21 22 or by considering the existence of a T -driven SG-to-AFM phase transition 23 .…”

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confidence: 55%

Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers

Rui

et al. 2015

Sci Rep

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We report on the experimental and theoretical studies of cooling field (HFC) and temperature (T) dependent exchange bias (EB) in FexAu1 − x/Fe19Ni81 spin glass (SG)/ferromagnet (FM) bilayers. When x varies from 8% to 14% in the FexAu1 − x SG alloys, with increasing T, a sign-changeable exchange bias field (HE) together with a unimodal distribution of coercivity (HC) are observed. Significantly, increasing in the magnitude of HFC reduces (increases) the value of HE in the negative (positive) region, resulting in the entire HE ∼ T curve to move leftwards and upwards. In the meanwhile, HFC variation has weak effects on HC. By Monte Carlo simulation using a SG/FM vector model, we are able to reproduce such HE dependences on T and HFC for the SG/FM system. Thus this work reveals that the SG/FM bilayer system containing intimately coupled interface, instead of a single SG layer, is responsible for the novel EB properties.

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confidence: 55%

Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers

Rui

et al. 2015

Sci Rep

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“…Industrial qualification of the EB spintronic devices requires the reduction in the width of the distributions such as H E and T B , the preservation of H E larger than the coercive field, and the maintaining of a significant part of the distribution of T B much above the working temperature [22]. The T B distributions consist of two parts: (i) a commonly observed high-temperature peak associated to thermally activated reversal of the AFM grain spin lattice [23] and (ii) a more unconventional low-temperature peak [24] ascribed to the FM/AFM interfacial spin-glass-like regions characterized by low freezing temperature [25].…”

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confidence: 98%

Anomalous temperature and interfacial‐coupling dependence of exchange bias in antiferromagnetic (core)/ferromagnetic (shell) nanoparticles

2011

Physica Status Solidi (b)

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In a single composite ferromagnetic/antiferromagnetic (AFM) nanoparticle with an unconventional core/shell morphology, the effects of temperature and interfacial coupling on the exchange bias (EB) are studied by performing a modified Monte Carlo method. With the decrease of temperature, three distinct behaviors of the EB are obtained as a result of the state transitions of the AFM spins from completely free via partially free and partially frozen, and, finally, to completely frozen. The behaviors of the coercivity are nonmonotonic due to the energy competitions and the thermal fluctuations. Moreover, the cooling field affects strongly the low-temperature behaviors of the EB. The EB field obtained after field cooling is negative and almost constant, independent of the interfacial coupling. However, after zero-field cooling, the EB field may exhibit a sign-reversal behavior with increasing interfacial coupling at low temperature. On the basis of the theory of the surplus magnetization, it is revealed that the drastic temperature dependence and the energy competition mechanism at the interface in the cooling process are responsible for this unique property in such novel nanostructures.

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“…The frequently observed negative H EX is attributed to a ferromagnetic exchange coupling between the FM and AF interfacial spins, whereas the rarely observed positive H EX is caused by antiferromagnetic exchange coupling. [25][26][27][28][29][30][31][32] The exchange bias effect is not only observed in conventional FM/AF systems but also in soft FMs coupled with a hard FM or ferrimagnet. [33][34][35][36][37][38][39][40][41][42][43][44] The hard FM or ferrimagnet has a larger coercive field for switching the magnetization direction than the soft FM, so it can be used as a pinning layer to fix the magnetization direction of the latter.…”

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confidence: 99%

Magnetic-field-induced switchable exchange bias in NiFe film on (110) Fe3O4 with a strong uniaxial magnetic anisotropy

Dho

2015

Applied Physics Letters

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The exchange bias in a soft ferromagnetic NiFe layer coupled with a hard ferrimagnetic Fe3O4 film grown on a (110) SrTiO3 single-crystal substrate was investigated as a function of the switching magnetic field (HS) as a means to control the magnetization direction of the Fe3O4. The sign of the exchange bias was consistent with the sign of HS, indicating that the exchange coupling constant between the NiFe and (110) Fe3O4 layers was positive. Below |HS| = 1 kOe, the hysteresis behavior of the exchange bias of the soft ferromagnetic NiFe resembled the magnetic hysteresis behavior of the hard ferrimagnetic Fe3O4.

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Role of interface alloying in the exchange bias of Fe/Cr bilayers

Cited by 15 publications

References 26 publications

Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers

Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers

Anomalous temperature and interfacial‐coupling dependence of exchange bias in antiferromagnetic (core)/ferromagnetic (shell) nanoparticles

Magnetic-field-induced switchable exchange bias in NiFe film on (110) Fe3O4 with a strong uniaxial magnetic anisotropy

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