All-In–All-Out Magnetic Domains: X-Ray Diffraction Imaging and Magnetic Field Control

Tardif, Samuel; Takeshita, Satoshi; Ohsumi, H.; Yamaura, Jun Ichi; Okuyama, Daisuke; Hiroi, Zenji; Takata, Masaki; Arima, T.

doi:10.1103/physrevlett.114.147205

Cited by 44 publications

(53 citation statements)

References 34 publications

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“…Thus, we think that M rob originates from MDWs; the sample dependence must be due to a difference in the density of crystalline defects that pin down MDWs. The magnitude of M rob is reasonably explained by the observed density of MDWs14 (Supplementary Section 2).…”

Section: Discussionsupporting

confidence: 60%

“…There are two kinds of magnetic domains that can coexist13: the AIAO and all-out/all-in (AOAI) orders related by the time reversal symmetry with each other. The coexistence of the two domains has actually been visualized in Cd 2 Os 2 O 7 by the circular polarized resonant X-ray diffraction imaging technique14. On the other hand, microwave impedance microscopy successfully visualized the MDWs of Nd 2 Ir 2 O 7 , which indicates that the MDWs remain conducting even when the domains themselves become insulating1516.…”

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confidence: 98%

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Robust ferromagnetism carried by antiferromagnetic domain walls

Hirose

Yamaura

Hiroi

2017

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Ferroic materials, such as ferromagnetic or ferroelectric materials, have been utilized as recording media for memory devices. A recent trend for downsizing, however, requires an alternative, because ferroic orders tend to become unstable for miniaturization. The domain wall nanoelectronics is a new developing direction for next-generation devices, in which atomic domain walls, rather than conventional, large domains themselves, are the active elements. Here we show that atomically thin magnetic domain walls generated in the antiferromagnetic insulator Cd2Os2O7 carry unusual ferromagnetic moments perpendicular to the wall as well as electron conductivity: the ferromagnetic moments are easily polarized even by a tiny field of 1 mT at high temperature, while, once cooled down, they are surprisingly robust even in an inverse magnetic field of 7 T. Thus, the magnetic domain walls could serve as a new-type of microscopic, switchable and electrically readable magnetic medium which is potentially important for future applications in the domain wall nanoelectronics.

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Section: Discussionsupporting

confidence: 60%

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confidence: 98%

Robust ferromagnetism carried by antiferromagnetic domain walls

Hirose

Yamaura

Hiroi

2017

Sci Rep

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“…Until its magnetic ground state was revealed, this material was best known as one of a few examples of a Slater insulator [20]. However, recent experimental [19,21] and theoretical [22,23] In this Letter, we report on the detailed temperature (T) evolution of the optical spectra of Cd 2 Os 2 O 7 to reveal how the emergence of AIAO ordering affects the electronic structure and induces the MITs. The absorption edge analyses suggest the Lifshitz-type MIT where a rigid shift of the bands away from the Fermi level E F gradually annihilates the Fermi surface [22,24].…”

mentioning

confidence: 93%

“…Until its magnetic ground state was revealed, this material was best known as one of a few examples of a Slater insulator [20]. However, recent experimental [19,21] and theoretical [22,23] results showed that the magnetic ground state in Cd 2 Os 2 O 7 is AIAO ordering. Investigations on Cd 2 Os 2 O 7 should provide an understanding of how AIAO ordering causes MITs in 5d pyrochlores.…”

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confidence: 99%

Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In–All-Out Magnetic Ordering in5dPyrochloreCd2Os
Sohn
¹
,
Jeong
²
,
Jin
³

et al. 2015
Phys. Rev. Lett.
26
5
31
0
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We investigated the metal-insulator transition (MIT) driven by all-in-all-out (AIAO) antiferromagnetic ordering in the 5d pyrochlore Cd 2 Os 2 O 7 using optical spectroscopy and first-principles calculations. We showed that the temperature evolution in the band-gap edge and free carrier density were consistent with rigid upward (downward) shifts of electron (hole) bands, similar to the case of Lifshitz transitions. The delicate relationship between the band gap and free carrier density provides experimental evidence for the presence of an AIAO metallic phase, a natural consequence of such MITs. The associated spectral weight change at high energy and first-principles calculations further support the origin of the MIT from the band shift near the Fermi level. Recently, MITs and antiferromagnetic ordering in 5d pyrochlores, A 2 B 2 O 7 (B ¼ Ir, Os), have received much attention due to their strong correlation and the key role they play in novel phases. The MITs in these compounds [3][4][5][6][7][8] reportedly are prompted by the emergence of magnetic ordering. Such magnetism-driven MITs are expected to induce exotic phenomena, including a Weyl semimetal [9][10][11][12] and quantum criticality [13] in rare-earth pyrochlore iridates. However, questions remain as to how magnetic ordering induces MITs in 5d pyrochlores.The peculiar antiferromagnetic structure in 5d pyrochlores makes the MITs distinct from the Slater type [14], a wellknown magnetic-driven MIT. In the original Slater picture, collinear antiferromagnetic ordering induces a doubling of the lattice periodicity, resulting in a BCS-like band gap at the folded zone boundaries. However, recent studies support that the magnetic ground states in 5d pyrochlores are noncollinear all-in-all-out (AIAO) magnetic orderings [9][10][11][15][16][17], where all spins in transition metal ions align inward or outward of tetrahedra. Since AIAO ordering maintains the unit cell of pyrochlores, a new paradigm beyond the Slater picture is essential to understanding MITs in 5d pyrochlores.Cd 2 Os 2 O 7 is a good candidate for the study of such MITs, in that it shows a continuous MIT at an antiferromagnetic ordering temperature T N (¼ 227 K) [18,19]. Until its magnetic ground state was revealed, this material was best known as one of a few examples of a Slater insulator [20]. However, recent experimental [19,21] and theoretical [22,23] results showed that the magnetic ground state in Cd 2 Os 2 O 7 is AIAO ordering. Investigations on Cd 2 Os 2 O 7 should provide an understanding of how AIAO ordering causes MITs in 5d pyrochlores.In this Letter, we report on the detailed temperature (T) evolution of the optical spectra of Cd 2 Os 2 O 7 to reveal how the emergence of AIAO ordering affects the electronic structure and induces the MITs. The absorption edge analyses suggest the Lifshitz-type MIT where a rigid shift of the bands away from the Fermi level E F gradually annihilates the Fermi surface [22,24]. The model based on the Lifshitz-type MIT reproduces the delicate relationship betw...

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“…An example has been discussed in the peculiar magnetically ordered state called all-in all-out type in pyrochlore oxides. For instance, in Cd 2 Os 2 O 7 , the domain formation was observed using resonant x-ray diffraction, and controllability of the domain structures by a magnetic field-cooling procedure was demonstrated 19 . Meanwhile, for iridium pyrochlore oxides, peculiar electronic states were theoretically predicted, such as the Weyl semimetal 20 and peculiar metallic DWs 21,22 .…”

Section: Introductionmentioning

confidence: 99%

Shape of magnetic domain walls formed by coupling to mobile charges

et al. 2017

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Magnetic domain walls, which are crucially important in both fundamental physics and technical applications, often have a preference in their form due to many different origins, such as the crystalline shape, lattice symmetry, and magnetic anisotropy. We theoretically investigate yet another origin stemming from the coupling to mobile charges in itinerant magnets. Performing a large-scale numerical simulation in a minimal model for itinerant magnets, i.e., the Kondo lattice model with classical localized spins, we show that the shape of magnetic domain walls depends on the electronic band structure and electron filling. While Néel and 120• antiferromagnetic states do not show a strong preference in the shape of domain walls, noncoplanar spin states with scalar chiral ordering have distinct directional preferences of the domain walls depending on the electron filling. We find that the directional preference is rationalized by the wave-number dependence of the effective magnetic interactions induced by the mobile charges, which are set by the band structure and electron filling. We also observe that, in the noncoplanar chiral states, an electric current is induced along the domain walls owing to the spin Berry phase mechanism, with very different spatial distributions depending on whether the bulk state is metallic or insulating.

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All-In–All-Out Magnetic Domains: X-Ray Diffraction Imaging and Magnetic Field Control

Cited by 44 publications

References 34 publications

Robust ferromagnetism carried by antiferromagnetic domain walls

Robust ferromagnetism carried by antiferromagnetic domain walls

Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In–All-Out Magnetic Ordering in5dPyrochloreCd2Os
Sohn
¹
,
Jeong
²
,
Jin
³

et al. 2015
Phys. Rev. Lett.
26
5
31
0
View full text Add to dashboard Cite

Shape of magnetic domain walls formed by coupling to mobile charges

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All-In–All-Out Magnetic Domains: X-Ray Diffraction Imaging and Magnetic Field Control

Cited by 44 publications

References 34 publications

Robust ferromagnetism carried by antiferromagnetic domain walls

Robust ferromagnetism carried by antiferromagnetic domain walls

Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In–All-Out Magnetic Ordering in5dPyrochloreCd2OsSohn1, Jeong2, Jin3 et al. 2015Phys. Rev. Lett.265310View full textAdd to dashboardCite

Shape of magnetic domain walls formed by coupling to mobile charges

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About

Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In–All-Out Magnetic Ordering in5dPyrochloreCd2Os
Sohn
¹
,
Jeong
²
,
Jin
³

et al. 2015
Phys. Rev. Lett.
26
5
31
0
View full text Add to dashboard Cite