Fe/CoO(001) and Fe/CoO(111) bilayers: Effect of crystal orientation on the exchange bias

Młyńczak, Ewa; Matlak, B.; Kozioł–Rachwał, A.; Gurgul, Jacek; Spiridis, N.; Korecki, J.

doi:10.1103/physrevb.88.085442

Cited by 36 publications

(22 citation statements)

References 56 publications

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“…Considering T EB < T N , the temperature dependence of the H E is given by

H_{E} \propto (1 - \frac{T}{T_{EB}})

from the RFM model . The best fit (using T EB = 150 K), as reported in the inset of Figure , gives clearly a linear relationship between H E and

(1 - \frac{T}{T_{EB}})

in agreement with the linear propensity of FeNi‐CoO reported by Carey and Berkowitz and that of Fe–CoO by Mlynczak et al The present studies thus open the scope for further investigation on ferromagnetic FeCo with various shells and the influence of various physical parameters on the EB characteristics, for the particles synthesized using the chemical reduction process.…”

Section: Introductionsupporting

confidence: 87%

“…The T EB is usually either less than or nearly equal to the Néel temperature ( T N ) according to the magnetic anisotropy and thickness of the AFM phase. Thus, T EB of FM‐CoO alloy is close to T N of 290 K whereas that of FM‐Fe‐oxide is below 50 K . Assuming the presence of γ‐Fe 2 O 3 with average thickness close to 2.2 and 2.7 nm in the as‐prepared and size‐reduced FeCo, respectively, the T EB is not expected to differ by 100 K between them.…”

Section: Introductionmentioning

confidence: 71%

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Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

Ponraj

Grenèche

Jacob

et al. 2019

Physica Status Solidi (a)

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The equiatomic FeCo alloy with average particle sizes of 140 and 30 nm is obtained using an instant chemical reduction process. The mean hyperfine field of 36.0(5) T estimated from 300 K 57Fe Mössbauer spectra is consistent with a disordered FeCo phase with a relative fraction of 90(2)% for both the samples, along with γ‐Fe2O3. A CoO shell with an average thickness of 2.7 nm is inferred from transmission electron microscopy in the size‐reduced FeCo. The room temperature coercivity of the size‐reduced FeCo is higher than the expected theoretical values. An exchange bias field (HE of 296 Oe), vertical remanence shift at 15 K, and an exchange bias blocking temperature of 150 K are exhibited by the 30 nm FeCo particles. The observed HE and its temperature dependence are fairly explained based on a random field model.

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“…Considering T EB < T N , the temperature dependence of the H E is given by

H_{E} \propto (1 - \frac{T}{T_{EB}})

from the RFM model . The best fit (using T EB = 150 K), as reported in the inset of Figure , gives clearly a linear relationship between H E and

(1 - \frac{T}{T_{EB}})

Section: Introductionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 71%

Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

Ponraj

Grenèche

Jacob

et al. 2019

Physica Status Solidi (a)

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“…CoO was considered as a model system to study the exchange coupling effect in FM/AFM systems, because of its easily accessible Néel temperature (T N ~ 290 K), which is close to room temperature (RT) [17,18], and the high-quality epitaxial growth of CoO films [19,20]. Moreover, the AFM properties of CoO films can be measured directly by the X-ray magnetic linear dichroism (XMLD) effect [11,13,19,21,22].…”

Section: Introductionmentioning

confidence: 99%

Multiple in-plane spin reorientation transitions inFe/CoObilayers grown on vicinalMgO(001)

Zhu

et al. 2015

Phys. Rev. B

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Step-induced antiferromagnetic (AFM) uniaxial anisotropy and its effects on the exchange coupling have been systematically investigated in the epitaxial Fe/CoO bilayers on MgO(001) vicinal surface. X-ray magnetic linear dichroism measurements proved that the atomic steps induced a strong in-plane AFM uniaxial anisotropy in the CoO film. We found that the thermal activation induced in-plane 90-degree switching of CoO AFM in-plane spins. The competition among the step-induced AFM anisotropy, the interface exchange coupling and thermal activation generate novel multiple in-plane spin reorientation transition of the Fe magnetization, which can further provide new insights on the exchange coupling in FM/AFM systems.2

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“…As an example, when the antiferromagnetic layers with different crystal orientations are selected, the magnetic properties of the heterostructures are completely different as there may exist compensated and uncompensated magnetic planes. 12 Furthermore, in the ferromagnetic/multiferroic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 4 systems, the interfacial construction could be modulated by an extra freedom of ferroelectric order, providing an effective way in mediating the magnetotransport properties by electric fields 13, 14 .…”

mentioning

confidence: 97%

Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO₃/La_0.6Sr_0.4MnO₃ Multiferroic Heterostructures

Zheng

Gong

Chen

et al. 2015

ACS Appl. Mater. Interfaces

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The magnetic properties of the all-oxide multiferroic heterostructures composed of orthorhombic YMnO3 (YMO) with E-type antiferromagnetic and double-exchange ferromagnetic (FM) La0.6Sr0.4MnO3 (LSMO) were studied. An orientation-modulated exchange bias effect, which is related to the interfacial Mn-O-Mn bond angle, was discovered. Because of the large bond angle in YMO/LSMO(100) heterostructures, a strong exchange coupling at the interface is formed. This strong exchange coupling sustains an FM phase in YMO at the interface region. The FM phase with strong magnetocrystalline anisotropy contributes to the vertical shift and exchange bias effect in (100) orientation heterostructures. When LSMO (110) and (111) were layered with YMO, the Mn-O-Mn bond angle was reduced, leading to a weakened exchange coupling at the interface, and only a relatively small exchange bias at low temperatures was visible.

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Fe/CoO(001) and Fe/CoO(111) bilayers: Effect of crystal orientation on the exchange bias

Cited by 36 publications

References 56 publications

Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

Multiple in-plane spin reorientation transitions inFe/CoObilayers grown on vicinalMgO(001)

Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO₃/La_0.6Sr_0.4MnO₃ Multiferroic Heterostructures

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Fe/CoO(001) and Fe/CoO(111) bilayers: Effect of crystal orientation on the exchange bias

Cited by 36 publications

References 56 publications

Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

Exchange Bias in Chemically Reduced FeCo Alloy Nanostructures

Multiple in-plane spin reorientation transitions inFe/CoObilayers grown on vicinalMgO(001)

Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO3/La0.6Sr0.4MnO3 Multiferroic Heterostructures

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Crystal-Orientation-Modulated Exchange Bias in Orthorhombic-YMnO₃/La_0.6Sr_0.4MnO₃ Multiferroic Heterostructures