Investigation of the Out of Plane Component of the Magnetization of [Fe72Ga28(x nm)/Tb33Fe67(50 nm)]2 Multilayers

Bartolomé, Pablo García; Maícas, M.; Biškup, N.; Varela, M.; Ranchal, R.

doi:10.1002/pssa.201800183

Cited by 3 publications

(5 citation statements)

References 24 publications

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“…In the [TbFeGa/TbFe] multilayers studied in this work it has already been reported a tilt angle of the magnetization with respect to the sample plane () of around 25 [31].…”

Section: Resultsmentioning

confidence: 59%

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Synthetic domain walls in [TbFeGa/TbFe]₂ multilayers

Bartolomé¹,

Ranchal²

2020

Nanotechnology

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Here we report the possibility of creating synthetic domain walls in nominal [Fe72Ga28/Tb33Fe67]2 multilayers. The magnetization as a function of the temperature reveals the absence of Compensation temperature in the samples which can be understood considering an interdiffusion process that results in the formation of TbFeGa alloys at the nominal FeGa layers. Therefore, samples are actually comprised of TbFeGa and TbFe layers. The hysteresis loops exhibit magnetization steps related to the nucleation of domain walls formed because of the competition between different interactions: i) the antiferromagnetic exchange coupling between the heavy rare earth (Tb) and the transition magnetic metal (Fe) inside each layer, ii) the antiferromagnetic coupling between Tb and Fe at the interfaces, and iii) the Zeeman energy. In good agreement with the experimental values, the nucleation field of the domain walls has been theoretically calculated taking into account the tilt of the magnetization with respect to the sample plane. Our experimental results indicate that by a proper thickness adjustment, it can be tuned both, the value of the nucleation field, and the layer in which this firstly occurs. Experimental values for the exchange bias field have also been calculated.

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“…In the [TbFeGa/TbFe] multilayers studied in this work it has already been reported a tilt angle of the magnetization with respect to the sample plane () of around 25 [31].…”

Section: Resultsmentioning

confidence: 59%

“…In the [TbFeGa/TbFe] multilayers studied in this work it has already been reported a tilt angle of the magnetization with respect to the sample plane (θ) of around 25 • [30]. Therefore, it is necessary to introduce this tilt in the expression of the nucleation field:…”

Section: Resultsmentioning

confidence: 97%

Synthetic domain walls in [TbFeGa/TbFe]₂ multilayers

Bartolomé¹,

Ranchal²

2020

Nanotechnology

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“…We monitored the cantilever's phase of oscillation while the magnetic tip was scanning the sample surface to work in the phase detection mode. The distance between sample and surface was 40 nm on average (lift mode) [33]. The MFM measurements were performed without magnetic eld after an OOP magnetic eld of 10 kOe was applied.…”

Section: Methodsmentioning

confidence: 99%

“…Although Cr 2 O 3 has already been coupled with ferromagnetic metals [30][31][32], the interaction with Fe 72 Ga 28 seems not a trivial problem. Fe 72 Ga 28 has already been coupled with TbFe 2 in [Fe 72 Ga 28 /TbFe 2 ] multilayers to turn its magnetization into the OOP direction [33][34]. However, only a tilt of the magnetization of around 25° with respect to the sample plane was achieved despite the large PMA of TbFe 2 [33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Fe 72 Ga 28 has already been coupled with TbFe 2 in [Fe 72 Ga 28 /TbFe 2 ] multilayers to turn its magnetization into the OOP direction [33][34]. However, only a tilt of the magnetization of around 25° with respect to the sample plane was achieved despite the large PMA of TbFe 2 [33][34]. Here we show that thanks to an appropriate election of layer thickness and coupling material, it is possible to reach an effective interfacial interaction that enables to turn the Fe 72 Ga 28 magnetization into the OOP direction.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Hontecillas

Maícas

Andrés³

et al. 2021

Preprint

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Here it is investigated the effect of the antiferromagnet Cr2O3 on the magnetic properties of ferromagnetic Fe72Ga28 thin films. Although Fe72Ga28 layers have their magnetization almost in the sample plane, the interfacial coupling with Cr2O3 that has perpendicular magnetic moments enables to turn the Fe72Ga28 magnetization direction into the out of plane (OOP) direction. Cr2O3 has been obtained from Cr oxidation, whereas Fe72Ga28 has been deposited on top of it by sputtering in the ballistic regime. Although a uniaxial in-plane magnetic anisotropy is expected for Fe72Ga28 thickness above 100 nm, the interfacial coupling with Cr2O3 prevents this anisotropy. The formation of stripe domains in Fe72Ga28 above a critical thickness reveals the enhancement of the out of plane component of the Fe72Ga28 magnetization with respect to uncoupled layers. Due to the interface coupling, the Fe72Ga28 magnetization turns into the out-of-plane direction as its thickness is gradually reduced, and a perpendicular magnetic anisotropy of 3.4·106 erg·cm− 3 is inferred from experimental results. Eventually, the coupling between Cr2O3 and Fe72Ga28 promotes an exchange-bias effect that has been well fitted by means of the random field model.

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Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Hontecillas

Maícas

Andrés

et al. 2021

Sci Rep

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Here it is investigated the effect of the antiferromagnet Cr2O3 on the magnetic properties of ferromagnetic Fe72Ga28 thin films. Sputtered Fe72Ga28 layers have their magnetization in the sample plane with a magnetic fluctuation that gives rise to magnetic ripple. In order to turn its magnetization into the out of plane (OOP) direction, it has been magnetically coupled with Cr2O3 that has magnetic moments along the c-axis, that is the perpendicular direction when properly aligned. Cr2O3 has been obtained from Cr oxidation, whereas Fe72Ga28 has been deposited on top of it by sputtering in the ballistic regime. Although a uniaxial in-plane magnetic anisotropy is expected for Fe72Ga28 thickness above 100 nm, the interfacial coupling with Cr2O3 prevents this anisotropy. The formation of stripe domains in Fe72Ga28 above a critical thickness reveals the enhancement of the out of plane component of the Fe72Ga28 magnetization with respect to uncoupled layers. Due to the interface coupling, the Fe72Ga28 magnetization turns into the out-of-plane direction as its thickness is gradually reduced, and a perpendicular magnetic anisotropy of 3·106 erg·cm−3 is inferred from experimental results. Eventually, the coupling between Cr2O3 and Fe72Ga28 promotes an exchange-bias effect that has been well fitted by means of the random field model.

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Investigation of the Out of Plane Component of the Magnetization of [Fe₇₂Ga₂₈(x nm)/Tb₃₃Fe₆₇(50 nm)]₂ Multilayers

Cited by 3 publications

References 24 publications

Synthetic domain walls in [TbFeGa/TbFe]₂ multilayers

Synthetic domain walls in [TbFeGa/TbFe]₂ multilayers

Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

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Investigation of the Out of Plane Component of the Magnetization of [Fe72Ga28(x nm)/Tb33Fe67(50 nm)]2 Multilayers

Cited by 3 publications

References 24 publications

Synthetic domain walls in [TbFeGa/TbFe]2 multilayers

Synthetic domain walls in [TbFeGa/TbFe]2 multilayers

Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

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Investigation of the Out of Plane Component of the Magnetization of [Fe₇₂Ga₂₈(x nm)/Tb₃₃Fe₆₇(50 nm)]₂ Multilayers

Synthetic domain walls in [TbFeGa/TbFe]₂ multilayers

Synthetic domain walls in [TbFeGa/TbFe]₂ multilayers