Piezomagnetic switching of the anomalous Hall effect in an antiferromagnet at room temperature

Ikhlas, Muhammad; Dasgupta, Sayak; Theuss, Florian; Higo, Tomoya; Kittaka, Shunichiro; Ramshaw, B. J.; Tchernyshyov, Oleg; Hicks, Clifford W.; Nakatsuji, Satoru

doi:10.1038/s41567-022-01645-5

Cited by 43 publications

(30 citation statements)

References 48 publications

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“…In contrast, the in-plane longitudinal magnetostriction is finite, implying that in-plane stress would affect the magnetization. Moreover, since the magnetostriction is linear in magnetic field, what would be affected is the spontaneous magnetization and not its slope, in agreement with what was found by the recent study of piezomagnetism [21].…”

Section: (D) Shows the Magnetizationsupporting

confidence: 91%

“…Piezomagnetism and linear magnetostriction-Let us now compare our results with the piezomagnetic data [21]. Maxwell relations imply a thermodynamic identity between the results of two probes [25]:…”

Section: Discussionmentioning

confidence: 75%

“…We show that the amplitude of the measured signal can be understood given the four relevant magnetic energies [5](Heisenberg, Dzyaloshinskii-Moriya, single-ion anisotropy, and Zeeman) and the elastic energy [37]. We compare the amplitude of linear magnetostriction resolved by our study with the piezomagnetic coefficient [21] and find that while they agree in order of magnitude, our magnetostrictive response is almost three times larger. Two sources for this discrepancy are identified.…”

Section: Introductionmentioning

confidence: 78%

“…Measuring the stress dependence of magnetization, Ikhlas et al [21] reported that dM dσ −0.055 Gauss MPa −1 for the x-axis orientation (and slightly smaller in another sample along the y-direction). Now, magnetization in S.I.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the discovery has a technological potential in the field of antiferromagnetic spintronics [16][17][18][19][20]. Very recently, Ikhlas et al [21] reported that Mn 3 Sn displays a large piezomagnetic effect at room temperature and the sign of the AHE can be modified by a sufficiently large uniaxial stress. By contrasting the response of magnetization and AHE, they demonstrated that, as was theoretically predicted [22], in a non-collinear antiferromagnet residual the ultimate origin of the AHE is the fact the residual Berry curvature after cancellation and not the spontaneous ferromagnetic-like magnetization.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Magnetostriction, piezomagnetism and domain nucleation in Mn$_3$Sn

Meng¹,

Nie²,

Xu³

et al. 2023

Preprint

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Whenever the elastic energy depends on magnetic field, there is magnetostriction. Field-linear magnetostrictive response implies piezomagnetism and vice versa. Here, we show that there is a large and almost perfectly linear room-temperature magnetostriction in Mn3Sn, a non-collinear antiferromanget with Weyl nodes. Longitudinal magnetostriction is negative and isotropic (Λ11 = Λ22 ≈ −1.5 ± 0.3 × 10 −5 T −1 ) and slightly larger than a transverse magnetostriction of opposite sign (Λ12 = Λ21 ≈ +1.1 ± 0.3 × 10 −5 T −1 ). We argue that this is caused by the field-induced twist of spins. This field-linear magnetostriction, which can be quantitatively accounted for by the magnetic and elastic energy scales of the inter-twinned spin-lattice texture, is three times larger than the recently measured piezomagnetic coefficient. We find that the components of the piezomagnetic tensor, Λ, evolve with variation in Mn excess. At the threshold magnetic field of domain nucleation (B0 = 0.02 T), a second-order phase transition is identified by detecting a jump in longitudinal magnetostriction. In a narrow field window, where the magnetic field and the prevailing magnetic domain have opposite polarities, competition between magnetic and elastic energies generate twistomagnetic stripes.

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Section: (D) Shows the Magnetizationsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetostriction, piezomagnetism and domain nucleation in Mn$_3$Sn

Meng¹,

Nie²,

Xu³

et al. 2023

Preprint

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Large Anomalous Hall Effect at Room Temperature in a Fermi‐Level‐Tuned Kagome Antiferromagnet

Song,

Zhou,

et al. 2024

Adv Funct Materials

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The recent discoveries of surprisingly large anomalous Hall effect (AHE) in antiferromagnets have attracted much attention due to their promising use in spintronics devices. However, such AHE‐hosting antiferromagnetic materials are rare in nature. Herein, it is demonstrated that Mn2.4Ga, a Fermi‐level‐tuned kagome antiferromagnet, has a large anomalous Hall conductivity of ≈150 Ω−1 cm−1 at room temperature that surpasses the usual high values (i.e., 20–50 Ω−1 cm−1) observed so far in two outstanding kagome antiferromagnets, Mn3Sn and Mn3Ge. Although the triangular spin structure of Mn2.4Ga shows a weak net magnetic moment of ≈0.05 µB per formula unit, it guarantees a nonzero Berry curvature in the kagome plane. Moreover, the anomalous Hall conductivity exhibits a sign reversal with the rotation of a small magnetic field that can be ascribed to the field‐controlled chirality of the spin triangular structure. This theoretical calculations further suggest that the large AHE in Mn2.4Ga originates from a significantly enhanced Berry curvature associated with the tuning of the Fermi level close to the Weyl points. These properties, together with the ability to manipulate moment orientations using a moderate external magnetic field, make Mn2.4Ga extremely exciting for future antiferromagnetic spintronics.

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Strain‐Control of Cycloidal Spin Order in a Metallic Van der Waals Magnet

Huang

Gamage

et al. 2023

Advanced Materials

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The manipulation of magnetism through strain control is a captivating area of research with potential applications for low‐power devices that do not require dissipative currents. Recent investigations of insulating multiferroics have unveiled tunable relationships among polar lattice distortions, Dzyaloshinskii–Moriya interactions (DMI), and cycloidal spin orders that break inversion symmetry. These findings have raised the possibility of utilizing strain or strain gradient to manipulate intricate magnetic states by changing polarization. However, the effectiveness of manipulating cycloidal spin orders in “metallic” materials with screened magnetism‐relevant electric polarization remains uncertain. In this study, the reversible strain control of cycloidal spin textures in a metallic van der Waals magnet, Cr1/3TaS2, through the modulation of polarization and DMI induced by strain is demonstrated. With thermally‐induced biaxial strains and isothermally‐applied uniaxial strains, systematic manipulation of the sign and wavelength of the cycloidal spin textures is realized, respectively. Additionally, unprecedented reflectivity reduction under strain and domain modification at a record‐low current density are also discovered. These findings establish a connection between polarization and cycloidal spins in metallic materials and present a new avenue for utilizing the remarkable tunability of cycloidal magnetic textures and optical functionality in van der Waals metals with strain.

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Piezomagnetic switching of the anomalous Hall effect in an antiferromagnet at room temperature

Cited by 43 publications

References 48 publications

Magnetostriction, piezomagnetism and domain nucleation in Mn$_3$Sn

Magnetostriction, piezomagnetism and domain nucleation in Mn$_3$Sn

Large Anomalous Hall Effect at Room Temperature in a Fermi‐Level‐Tuned Kagome Antiferromagnet

Strain‐Control of Cycloidal Spin Order in a Metallic Van der Waals Magnet

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