Magnetization switching behavior with competing anisotropies in epitaxial 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Co</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mrow><mml:mi>FeN</mml:mi><mml:mo>/</mml:mo><mml:mi>MnN</mml:mi></mml:mrow></mml:mrow></mml:math>
 exchange-coupled bilayers

Hajiri, Tetsuya; Yoshida, Toshio; Jaiswal, Samridh; Filianina, Mariia; Borie, B.; Ando, Hiroki; Asano, Hidefumi; Zabel, H.; Kläui, Mathias

doi:10.1103/physrevb.94.184412

Cited by 7 publications

(13 citation statements)

References 36 publications

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“…4(d), the magnetization rotates in 3 steps along the hard axes; (i) the magnetization rotates toward the nearest easy axis, (ii) the magnetization jumps in a direction close to the other easy axis, and (iii) the magnetization finally rotates toward the applied field direction [41]. Therefore, the magnetization rotates by up to 90…”

Section: Resultsmentioning

confidence: 99%

Impact of anisotropy on antiferromagnet rotation in Heusler-type ferromagnet/antiferromagnet epitaxial bilayers

Hajiri

Matsushita

et al. 2017

Phys. Rev. B

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We report the magnetotransport properties of ferromagnet (FM)/antiferromagnet (AFM) Fe2CrSi/Ru2MnGe epitaxial bilayers using current-in-plane configurations. Above the critical thickness of the Ru2MnGe layer to induce exchange bias, symmetric and asymmetric curves were observed in response to the direction of FM magnetocrystalline anisotropy. Because each magnetoresistance curve showed full and partial AFM rotation, the magnetoresistance curves imply the impact of the Fe2CrSi magnetocrystalline anisotropy to govern the AFM rotation. The maximum magnitude of the angular-dependent resistance-change ratio of the bilayers is more than an order of magnitude larger than that of single-layer Fe2CrSi films, resulting from the reorientation of AFM spins via the FM rotation. These results highlight the essential role of controlling the AFM rotation and reveal a facile approach to detect the AFM moment even in current-in-plane configurations in FM/AFM bilayers.

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Section: Resultsmentioning

confidence: 99%

Impact of anisotropy on antiferromagnet rotation in Heusler-type ferromagnet/antiferromagnet epitaxial bilayers

Hajiri

Matsushita

et al. 2017

Phys. Rev. B

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“…In addition, to check the universality of this relationship, we considered collinear AFM MnN/CFN bilayers, because the MnN has a rocksalt structure with a much higher Néel temperature at 650 K and larger AFM local moment of 3.3 µ B /Mn than for MAN [56][57][58] . As shown in Fig.…”

Section: Smallmentioning

confidence: 99%

Scaling the electrical current switching of exchange bias in fully epitaxial antiferromagnet/ferromagnet bilayers

2020

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While the electrical current manipulation of antiferromagnets (AFMs) has been demonstrated, the extent of the studied AFM materials has been limited with few systematic experiments and a poor understanding. We compare the electrical current switching of the exchange-bias field (Hex) in AFM-Mn3AN/ferromagnet-Co3FeN bilayers. An applied pulse current can manipulate Hex with respect to the current density and FM layer magnetization, which shifts exponentially as a function of the current density. We found that the saturation current density and exponential decay constant τ increase with the local moment of AFM Mn atoms. Our results highlight the effect of the AFM local moment to electrical current switching of Hex, although it has a near-zero net magnetization, and may provide a facile way to explore the electrical current manipulation of AFM materials.

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“…High-quality epitaxial CFN (5 nm)/MnN (30 nm) bilayers were prepared by reactive magnetron sputtering on MgAl 2 O 4 substrates, as described elsewhere [38]. The bilayers were capped with 3 nm Hf layer to prevent oxidation.…”

Section: Methodsmentioning

confidence: 99%

“…MnN exhibits a high Néel temperature of 640 K, although it does not contain heavy metals [36,37]. Field cooling (FC) was carried out along the easy axis of the fourfold magnetocrystalline anisotropy of CFN [38]. In this situation, the magnetization switching process and angular-dependent exchange bias of those bilayers can be reproduced by combining a Stoner-Wohlfarth model and a 90° domain wall nucleation and propagation model [38].…”

Section: Introductionmentioning

confidence: 99%

“…Field cooling (FC) was carried out along the easy axis of the fourfold magnetocrystalline anisotropy of CFN [38]. In this situation, the magnetization switching process and angular-dependent exchange bias of those bilayers can be reproduced by combining a Stoner-Wohlfarth model and a 90° domain wall nucleation and propagation model [38]. However, our previous study only dealt with FC along the easy axis of CFN.…”

Section: Introductionmentioning

confidence: 99%

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45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co₃FeN/MnN bilayers

Hajiri

Yoshida

Filianina

et al. 2017

J. Phys.: Condens. Matter

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We report an unusual angular-dependent exchange bias effect in ferromagnet/antiferromagnet bilayers, where both ferromagnet and antiferromagnet are epitaxially grown. Numerical model calculations predict an approximately 45$^\circ$ period for the sign switching of the exchange-bias field, depending on the ratio between magnetocrystalline anisotropy and exchange-coupling constant. The switching of the sign is indicative of a competition between a fourfold magnetocrystalline anisotropy of the ferromagnet and a unidirectional anisotropy field of the exchange coupling. This predicted unusual angular-dependent exchange bias and its magnetization switching process are confirmed by measurements on fully epitaxial Co$_3$FeN/MnN bilayers by longitudinal and transverse magneto-optic Kerr effect magnetometry. These results provide a deeper understanding of the exchange coupling phenomena in fully epitaxial bilayers with tailored materials and open up a complex switching energy landscape engineering by anisotropies.

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Magnetization switching behavior with competing anisotropies in epitaxial Co3FeN/MnN exchange-coupled bilayers

Cited by 7 publications

References 36 publications

Impact of anisotropy on antiferromagnet rotation in Heusler-type ferromagnet/antiferromagnet epitaxial bilayers

Impact of anisotropy on antiferromagnet rotation in Heusler-type ferromagnet/antiferromagnet epitaxial bilayers

Scaling the electrical current switching of exchange bias in fully epitaxial antiferromagnet/ferromagnet bilayers

45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co₃FeN/MnN bilayers

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Magnetization switching behavior with competing anisotropies in epitaxial Co3FeN/MnN exchange-coupled bilayers

Cited by 7 publications

References 36 publications

Impact of anisotropy on antiferromagnet rotation in Heusler-type ferromagnet/antiferromagnet epitaxial bilayers

Impact of anisotropy on antiferromagnet rotation in Heusler-type ferromagnet/antiferromagnet epitaxial bilayers

Scaling the electrical current switching of exchange bias in fully epitaxial antiferromagnet/ferromagnet bilayers

45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers

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45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co₃FeN/MnN bilayers