Antiferromagnetic spin and twin domain walls govern hysteretic expressions of exchange anisotropy

Armstrong, Jason N.; Sullivan, Matthew R.; Chopra, Harsh Deep

doi:10.1103/physrevb.80.104429

Cited by 10 publications

(7 citation statements)

References 60 publications

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“…The size of twin domains platelets in Fig. 1a is about 2 − 7 µm, being in agreement with that found in [5]. On the contrary, the strip-like domain pattern has parallel (180°) orientation of the magnetic domains in NiO(110) (Fig.…”

Section: Resultssupporting

confidence: 77%

“…Experimentally the domain structure of NiO has been studied in the past using neutron diffraction [4], polarized optical microscopy [4][5][6][7][8][9], and polarization dependent x-ray photoemission electron microscopy [10]. In the recent work [5], it was shown by studying the NiO(100) surface that the presence of complex assembly of twins predefines the formation of the spin domain walls (S-walls), and the imper-fect nature of crystallographic twin interfaces gives rise to net moment able to pin the Weiss walls in exchange coupled ferromagnetic layer.…”

Section: Introductionmentioning

confidence: 99%

“…The rhombohedral cell parameters are 0 = 2 9481 Å, α = 60 080°at 10 K and 0 = 2 9533 Å, α = 60 037°a t 295 K [2]. In the antiferromagnetic state, the pres- * E-mail: ulman@latnet.lv ence in NiO of crystallographic twins leads to the formation of antiferromagnetic twin-domains (T-type), having the walls at twin interfaces [3][4][5]. Spins order ferromagnetically in {111} planes in T-domains, but the antiferromagnetic spins alignment occurs in adjacent planes [6].…”

Section: Introductionmentioning

confidence: 99%

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Polarisation dependent Raman study of single-crystal nickel oxide

et al. 2011

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Abstract:The magnetic domain structure and Raman scattering have been studied in NiO single-crystals with three different (100), (110) and (111) orientations. Twin-domain structure was observed in NiO (100) and NiO(110) single-crystals using cross-polarized optical microscopy. We found that the ratio of the two-magnon (at 1500 cm −1 ) to the two-phonon (2LO, at 1100 cm −1 ) Raman bands intensity is sensitive in a particular way to the type of the twin-domain pattern. PACS

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarisation dependent Raman study of single-crystal nickel oxide

et al. 2011

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“…[5][6][7][8][9][10][11] However, few microscopic observations with submicrometer resolution have been reported. Weber and co-workers successfully observed the {001} T wall, the 180 • S wall, and double-wall structures by a combination of photoemission electron microscope (PEEM) and x-ray magnetic linear dichroism (XMLD) in the soft-x-ray range.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional spin orientation in antiferromagnetic domain walls of NiO studied by x-ray magnetic linear dichroism photoemission electron microscopy

et al. 2012

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A determination of the three-dimensional spin directions in all types of domain walls (DWs) of antiferromagnetic NiO has been successfully performed by photoemission electron microscopy combined with x-ray magnetic linear dichroism (XMLD), both for sand p-polarized light. By comparing the azimuthal angle dependence of the XMLD contrast in the DWs with cluster model calculations which include the crystal symmetry and full-multiplet splitting, we determine the spin structures in the {001} T walls, {011} T walls, 120 • S walls, and 180 • S walls. In some cases, distinct S walls are not formed between two adjacent S domains, and the spin direction changes gradually over a wide range of the S domain structures. In the S walls, the spin direction is parallel to the magnetic easy {111} plane. These spin configurations arise from the large difference in anisotropy energy between the in-plane and out-of-plane directions. Unexpectedly large widths in the several hundred nanometer range were observed for all the DWs. This also shows that NiO has a small magnetocrystalline anisotropy energy. Together with Monte Carlo simulation results, the qualitative phenomena concerning the wall energies are discussed. We further investigated the difference in wall energy between the {001} T wall and the {011} T wall. From the Monte Carlo simulation and an experimental study of heating effects, it is revealed that the {001} T wall energy is smaller than the {011} T wall energy.

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“…A similar dependence can be found for domains in antiferromagnets that are internally twinned as a result of phase transition from paramagnetism to antiferromagnetism below the Néel temperature. 3 Next, consider an amorphous Tb-Fe film with perpendicular anisotropy. In this case, the observed domains form meandering, maze-like patterns of remarkable complexity 4-8 as a result of out-of-plane anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Morphogenesis of maze-like magnetic domains

et al. 2010

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The present study explains the morphogenesis of maze-like magnetic domains in amorphous Tb-Fe films. It is shown that the observed morphological complexity of the maze-like patterns ͑which arise due to out-of-plane anisotropy͒ is superficial and can be explained by simple geometrical rules based on magnetostatic interactions between domains. Morphogenesis in applied field occurs in a fractal-like manner through growth of self-similar reversed domains of various shapes at progressively smaller length scales; the field-dependent fractal dimensions are quantified. The microscopic changes in domain morphology manifest as distinct kinks or "knees" in the macroscopic magnetization curves. Highly aligned synthetic patterns can be formed in microfabricated films, illustrating the potential for "domain engineering" for controlled magnetoelastic response.

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Antiferromagnetic spin and twin domain walls govern hysteretic expressions of exchange anisotropy

Cited by 10 publications

References 60 publications

Polarisation dependent Raman study of single-crystal nickel oxide

Polarisation dependent Raman study of single-crystal nickel oxide

Three-dimensional spin orientation in antiferromagnetic domain walls of NiO studied by x-ray magnetic linear dichroism photoemission electron microscopy

Morphogenesis of maze-like magnetic domains

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