Magnetic-field-induced color change in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>single crystals

Chen, P.; Lee, N.; McGill, Stephen; Cheong, Sang‐Wook; Musfeldt, J. L.

doi:10.1103/physrevb.85.174413

Cited by 28 publications

(20 citation statements)

References 38 publications

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“…30 Figure 1b shows a 2/ X-ray diffraction (XRD) scan of a phase-pure α-Fe2O3(30 nm) epitaxial film on Al2O3(001), where the Laue oscillations of the α-Fe2O3(006) peak in the inset indicate its high crystal quality. The 30,31 We pattern our Pt(2 nm)/α-Fe2O3(30nm) bilayers into 8leg Hall crosses using photolithography and ion etching, as shown in Figs. 2b and 2c, where the width of the two vertical Hall terminals is 5 μm and the other six legs (60 apart) are 10 μm wide.…”

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Electrical Switching of Tristate Antiferromagnetic Néel Order in α−Fe2O3 Epitaxial Films

et al. 2020

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These two authors contributed equally to this work. The ability to manipulate antiferromagnetic (AF) moments is a key requirement for the emerging field of antiferromagnetic spintronics. Electrical switching of bi-state AF moments has been demonstrated in metallic AFs, CuMnAs and Mn 2 Au. 1-5 Recently, current-induced "saw-tooth" shaped Hall resistance was reported in Pt/NiO bilayers, 6-9 while its mechanism is under debate. Here, we report the first demonstration of convincing, non-decaying, steplike electrical switching of tri-state Néel order in Pt/-Fe 2 O 3 bilayers. Our experimental data, together with Monte-Carlo simulations, reveal the clear mechanism of the switching behavior of -Fe 2 O 3 Néel order among three stable states. We also show that the observed "saw-tooth" Hall resistance is due to an artifact of Pt, not AF switching, while the signature of AF switching is step-like Hall signals. This demonstration of electrical control of magnetic moments in AF insulator (AFI) films will greatly expand the scope of AF spintronics by leveraging the large family of AFIs.Spin-orbit torque (SOT) induced switching of ferromagnets (FM) by an adjacent heavy metal (HM) has raised wide interests in recently years, 10-12 where a charge current in the HM generates spins at the HM/FM interface via the spin Hall effect (SHE). AFs offer the advantage of no stray field, robustness against external field, THz response, and abundance of material

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Electrical Switching of Tristate Antiferromagnetic Néel Order in α−Fe2O3 Epitaxial Films

et al. 2020

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“…α-Fe 2 O 3 spins are perpendicular to both the crystallographic c-axis and to one of the three 2-fold axes (magnetic space group C2/c), as previously reported. 11,12 The three possible orientations of the AFM moments, related by the broken 3-fold rotation axis of the crystallographic structure, form an intricate domain structure (Fig. 2 a) at the scale of a few tens of nm.…”

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Observation of magnetic vortex pairs at room temperature in a planar α-Fe2O3/Co heterostructure

et al. 2018

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Vortices, occurring whenever a flow field 'whirls' around a one-dimensional core, are among the simplest topological structures, ubiquitous to many branches of physics. In the crystalline state, vortex formation is rare, since it is generally hampered by long-range interactions: in ferroic materials (ferromagnetic and ferroelectric), vortices are observed only when the effects of the dipole-dipole interaction are modified by confinement at the nanoscale, or when the parameter associated with the vorticity does not couple directly with strain . Here, we observe an unprecedented form of vortices in antiferromagnetic haematite (α-FeO) epitaxial films, in which the primary whirling parameter is the staggered magnetization. Remarkably, ferromagnetic topological objects with the same vorticity and winding number as the α-FeO vortices are imprinted onto an ultra-thin Co ferromagnetic over-layer by interfacial exchange. Our data suggest that the ferromagnetic vortices may be merons (half-skyrmions, carrying an out-of plane core magnetization), and indicate that the vortex/meron pairs can be manipulated by the application of an in-plane magnetic field, giving rise to large-scale vortex-antivortex annihilation.

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“…2 inset) appears to be a collective excitation. These excitations, occurring near the band-edge, have been studied in similar materials 24,41,42 .…”

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confidence: 99%

“…However, the linear absorption spectrum showed strong absorption peaks which might indicate a substantial vibronic coupling that can make these transitions parity-allowed 24 . ED forbidden transitions which become allowed due to vibronic coupling are typically blue-shifted and broad compared to the zero-phonon lines (ZPL) 40 .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, one can use SHG for understanding both the structure and symmetry of the crystallographic and magnetic orders in MnTiO 3 . In linear absorption techniques, magnetic symmetry can be determined by analyzing the relationship between the magnetic order and collective excitations like excitons and magnon sidebands 24 . In light of the interesting properties and behavior exhibited by MnTiO 3 , we used SHG to probe its electronic structure.…”

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confidence: 99%

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Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

et al. 2013

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Second harmonic generation (SHG) and linear absorbance spectra of MnTiO3 were measured and the 1.88, 2.41, 2.63, and 3.06 eV SHG features were identified as d-d optical transitions from 6 A1g to 4 T1g( 4 G), 4 T2g( 4 G), { 4 Eg, 4 A1g( 4 G)}, and 4 Eg( 4 D) respectively. These zero-phonon transitions were used to calculate the octahedral crystal field splitting energy (∆0) and the Racah parameters B and C. The SHG spectra showed significant distinctions between the antiferromagnetic and the paramagnetic or spin-flop phases. The polarization dependence of the SHG in the spin-flop phase provided optical evidence that the spins canted from the c-axis toward the a-axis. These distinctions between the three magnetic phases could be useful for mapping 180 • antiferromagnetic domains in MnTiO3.2

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Magnetic-field-induced color change inα-Fe2O3single crystals

Cited by 28 publications

References 38 publications

Electrical Switching of Tristate Antiferromagnetic Néel Order in α−Fe2O3 Epitaxial Films

Electrical Switching of Tristate Antiferromagnetic Néel Order in α−Fe2O3 Epitaxial Films

Observation of magnetic vortex pairs at room temperature in a planar α-Fe2O3/Co heterostructure

Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

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