Multiple in-plane spin reorientation transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Fe</mml:mi><mml:mo>/</mml:mo><mml:mi>CoO</mml:mi></mml:mrow></mml:math>bilayers grown on vicinal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>MgO</mml:mi><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>

Li, Q.; Gu, Tianyu; Zhu, Jianguo; Ding, Zhaofeng; Li, J. X.; Liang, Jianhui; Luo, Yansheng; Hu, Zexiang; Hua, Chih-Yu; Lin, H. J.; Pi, Tun Wen; Won, C.; Wu, Y. Z.

doi:10.1103/physrevb.91.104424

Cited by 28 publications

(22 citation statements)

References 46 publications

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“…We first studied the magnetic properties of Ni(2 nm)/CoO(6.5 nm) bilayers grown on vicinal MgO(001) through element-specific XMCD and XMLD measurements. This phenomenon has also been observed in other systems such as in Fe/CoO [18], Fe/NiO [22] and Fe/FeF 2 [23]. To explore the CoO spin structure and its coupling to the Ni in Ni/CoO system, CoO spectra were taken at the Co 2+ L 3 edge with the linear polarization of the x-rays parallel and perpendicular to the steps at normal incidence [ Fig eV are lower for E//step than for E step ⊥ (E is the polarization direction of the x-rays),…”

Section: Resultssupporting

confidence: 79%

“…Since it is known that CoO on vicinal MgO(001) has its easy magnetization axis parallel to the steps and that the FM/CoO interfacial coupling favors a perpendicular alignment between the FM and CoO spins [18], all low temperature (LT) states of the sample at beamline 6.3.1 was achieved by cooling the sample with an in-plane magnetic field applied perpendicularly to the atomic steps of the vicinal surface (y axis in Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…1). Low-energy electron-diffraction (LEED) at each stage of the growth shows the formation of single-crystalline bcc Fe and fcc CoO films with Fe[100]//CoO[110]//MgO[110] and poly-crystalline Ni film[18,19].…”

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confidence: 99%

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Ni and CoO spin cantings induced by Fe layer in Ni/CoO/Fe/vicinal MgO(001)

Yang

N’Diaye

et al. 2017

Phys. Rev. B

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Using element-resolved X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) measurements, we studied Ni/CoO/vicinal MgO(001) and Ni/CoO/Fe/vicinal MgO(001) systems at 350 K and 78 K. Above the CoO Néel temperature, the Ni magnetization is fully in-plane and parallel to the atomic steps in both systems due to stepinduced magnetic anisotropy. Below the CoO Néel temperature, the CoO spins in Ni/CoO/vicinal MgO(001) are fully in-plane and parallel to the atomic steps and the Ni magnetization is fully in-plane and perpendicular to the atomic steps due to the 90-degree Ni/CoO magnetic coupling. The CoO spins in Ni/CoO/Fe/vicinal MgO(001), however, develop an out-of-plane canted spin component in addition to the in-plane component parallel to the atomic steps. Consequently, the Ni magnetization is canted towards the out-of-plane direction by an appreciable angle. Photoemission Electron Microscopy (PEEM) imaging shows a 90degree interfacial magnetic coupling at both the Ni/CoO and the CoO/Fe interfaces and an absence of a direct interlayer coupling, showing that the Ni spin canting is due to its coupling to the canted CoO spin components which is caused by the underlying ferromagnetic Fe layer in Ni/CoO/Fe/vicinal MgO(001).

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Section: Resultssupporting

confidence: 79%

Section: Methodsmentioning

confidence: 99%

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Ni and CoO spin cantings induced by Fe layer in Ni/CoO/Fe/vicinal MgO(001)

Yang

N’Diaye

et al. 2017

Phys. Rev. B

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“…[7][8][9][10][11][12][13] In AF thin films, the orientation of the spin axis is highly sensitive to strain, thus allowing manipulation via epitaxial strain [14][15][16] or by growth on vicinal substrates. [17][18][19] Moreover, in the absence of longrange magnetostatic forces, theoretical studies suggest that magnetoelastic forces in combination with surface anisotropy can lead to shape effects in the AF domain pattern. 20,21 Experimental studies of such AF shape effects are scarce, however, due to the challenges associated with patterning and magnetic measurements of AF structures with appropriate dimensions.…”

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confidence: 99%

Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures

Bang

Hallsteinsen

Chopdekar

et al. 2019

Applied Physics Letters

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In this study, we report on a shape-imposed magnetic anisotropy in micro-and nanostructures defined in antiferromagnetic (AF) LaFeO3 (LFO) thin films. Two distinct types of structures are investigated; embedded magnets created via ion implantation, and free-standing magnets created via ion milling. Using a combination of x-ray photoemission electron microscopy and x-ray absorption spectroscopy, we examine the impact of structure type, AF layer thickness, and crystal geometry on the Néel vector orientation in these structures. We demonstrate a distinct shape-imposed anisotropy in embedded and free-standing structures alike, and show that both parallel and perpendicular alignment of the AF spin axis with respect to structure edges can be achieved by variation of the AF layer thickness and the orientation of the structure edges with respect to the LFO crystalline axes. This work demonstrates how fabrication procedure affects the magnetic order in thin film AF nanostructures and shows how nanoscale patterning can be used to control the orientation of the Néel vector in epitaxial oxide thin films.

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“…We first took Co and Ni x-ray absorption spectra (XAS) in Fe/Co 0.5 Ni 0.5 O/vicinal Ag(001). It is known that a vicinal surface aligns the AFM spin axis for CoO(001) and NiO(001) films [27,30]. The different Néel temperatures (T N ) of CoO (T N ∼ 290) and NiO (T N ∼ 520 K) are expected to lead to an AFM Co 0.5 Ni 0.5 O film on vicinal Ag(001) with T N > 300 K [31][32][33] and with an in-plane spin axis perpendicular to the atomic steps [27].…”

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confidence: 99%

Chirality switching of an antiferromagnetic spiral wall and its effect on magnetic anisotropy

Yang

N’Diaye

et al. 2019

Phys. Rev. Materials

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An antiferromagnetic NiO spiral wall in Fe/NiO/Co 0.5 Ni 0.5 O/vicinal Ag(001) was created by rotating Fe magnetization and investigated using x-ray magnetic linear dichroism (XMLD). Different from the Mauri's 180°s piral wall, we find that the NiO spiral wall always switches its chirality at ∼90 • rotation of the Fe magnetization, and unwinds the spiral wall back to a single domain with a further rotation of the Fe magnetization from 90°to 180°. The effect of this chirality switching on the magnetic anisotropy was studied using rotational magneto-optic Kerr effect (ROTMOKE) on Py/NiO/Co 0.5 Ni 0.5 O/vicinal Ag(001). We find that the original Mauri's model has to be corrected by an energy folding due to the chirality switching, which consequently converts the exchange bias from the Mauri's 180°spiral wall into a uniaxial anisotropy and a negative fourfold anisotropy.

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

Cited by 28 publications

References 46 publications

Ni and CoO spin cantings induced by Fe layer in Ni/CoO/Fe/vicinal MgO(001)

Ni and CoO spin cantings induced by Fe layer in Ni/CoO/Fe/vicinal MgO(001)

Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures

Chirality switching of an antiferromagnetic spiral wall and its effect on magnetic anisotropy

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