Magnetism and deformation of epitaxial Pd and Rh thin films

Kaňa, Tomáš; Hüger, Erwin; Legut, Dominik; Čák, Miroslav; Šob, Mojmı́r

doi:10.1103/physrevb.93.134422

Cited by 6 publications

(4 citation statements)

References 75 publications

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“…The Ref. 12 shows that the method for volume correction to obtain good agreement with experiment of both lattice constant and magnetic ground state of Pd. On the other hand, our previous papers show that our present method using freestanding Pd slab with lattice constant of 0.384 nm obtained from the normal LDA method well reproduces the experimentally observed quantum-well induced ferromagnetism (Ref.…”

Section: Methodsmentioning

confidence: 71%

“…However, in the metal ultrathin film systems used in the electric field effect experiment, the electronic states are modified by the size effect and/or the local lattice distortion of the metals, and the magnetic states are different from those with bulk metals [9][10][11][12] . Especially, the quantum-well states occurring in ultrathin film formed from metal, in particular, modulate the density of states at the Fermi energy D(ǫ F ) in an oscillatory manner depending on the film thickness.…”

Section: Introductionmentioning

confidence: 99%

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Switching of magnetism via modifying phase shift of quantum-well states by tailoring the interface electronic structure

Sakuragi

Kageshima²,

Sato³

2020

Phys. Rev. B

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We demonstrate control of the magnetism of Pd(100) ultrathin films, which show d-electron quantum-well induced ferromagnetism, via modulation of the interface electronic state using density functional calculation. From an analysis based on the phase model, forming the Au/Pd(100) interface induces hybridization of the wave function of d-electron quantum-well states, and modulates the term of the scattering phase shift as a function of the reciprocal lattice point. In contrast, forming the Al interface, which has only s-electrons at the Fermi energy, cannot modify the scattering phase shift. Our finding indicates the possibility of modifying the phase shift by tailoring the interface electronic states using hybridization of the wave function, and this efficiently changes the density of states near the Fermi energy of Pd films, and the switching between paramagnetism and ferromagnetism occurs based on the condition for ferromagnetism (Stoner criterion).

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Section: Methodsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Switching of magnetism via modifying phase shift of quantum-well states by tailoring the interface electronic structure

Sakuragi

Kageshima²,

Sato³

2020

Phys. Rev. B

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“…In the case of Pd, the QW-induced lattice expansion enhances the stability of the ferromagnetic state [31,37]. This lattice distortion in the films could explain the discrepancy in the amplitude of the magnetic moment of a Pt atom between the experimental and calculated data [38][39][40].…”

Section: Discussionmentioning

confidence: 97%

Appearance of ferromagnetism in Pt(100) ultrathin films originated from quantum-well states

Yamada¹,

Ochiai²,

Kinoshita³

et al. 2021

Preprint

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Ferromagnetism was observed in a Pt(100) ultrathin film deposited on a SrTiO3(100) substrate. The ferromagnetism, which appears in films with thicknesses of 2.2-4.4 nm, periodically changes with a period of approximately 1 nm (5-6 ML) depending on the film thickness. This is consistent with the period derived from the quantum-well states formed in the thin film. X-ray magnetic circular dichroism measurements were conducted to understand the intrinsic nature of the ferromagnetism in the Pt(100) ultrathin films, and contrary to our expectations, the orbital magnetic moment of pure Pt is much smaller than that of the Pt/ferromagnetic multilayer system. These results suggest that the origin of the large magnetic anisotropy in Pt components cannot be explained only by the amount of spin-orbit coupling in Pt.

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“…This suggests that the measured spin polarization is related to strain. Strain, however, is related to Pd thin film ferromagnetism [43][44][45][46][82][83][84][85], as noted in the introduction. The expansive strain that appears to be associated to ferromagnetic Pd in prior work is about 1%-2% [45,84], while here the expansion of the Pd thin film lattice is 15% for the thinnest Pd films and reducing to 2% at Pd film thicknesses of 80 Å.…”

Section: The Correlation Between Strain and In-plane Pd Layer Surface...mentioning

confidence: 93%

The spin polarization of palladium on magneto-electric Cr₂O₃

Komesu

Echtenkamp

Binek

et al. 2023

J. Phys.: Condens. Matter

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While induced polarization of a palladium overlayer on antiferromagnetic and magneto-electric Cr2O3(0001) is possible because of the boundary polarization at the Cr2O3(0001), in the single domain state, the palladium (Pd) thin film appears to be ferromagnetic on its own, likely as a result of strain. In the conduction band, we find the experimental evidence of ferromagnetic spin polarized in Pd thin films on a Cr2O3(0001) single crystal, especially in the thin limit, Pd thickness of around 1-4 nm. Indeed there is significant spin polarization in 10 Å thick Pd films on Cr2O3(0001) at 310 K, i.e. above the Néel temperature of bulk Cr2O3. While Cr2O3(0001) has surface moments that tend to align along the surface normal, for Pd on Cr2O3, the spin polarization contains an in-plane component. Strain in the Pd adlayer on Cr2O3(0001) appears correlated to the spin polarization measured in spin polarized inverse photoemission spectroscopy. Further evidence for magnetization of Pd on Cr2O3 is provided by measurement of the exchange bias fields in Cr2O3/Pd(buffer)/[Co/Pd]n exchange bias systems. The magnitude of the exchange bias field is, over a wide temperature range, virtually unaffected by the Pd thickness variation between 1 and 2 nm.

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Magnetism and deformation of epitaxial Pd and Rh thin films

Cited by 6 publications

References 75 publications

Switching of magnetism via modifying phase shift of quantum-well states by tailoring the interface electronic structure

Switching of magnetism via modifying phase shift of quantum-well states by tailoring the interface electronic structure

Appearance of ferromagnetism in Pt(100) ultrathin films originated from quantum-well states

The spin polarization of palladium on magneto-electric Cr₂O₃

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Magnetism and deformation of epitaxial Pd and Rh thin films

Cited by 6 publications

References 75 publications

Switching of magnetism via modifying phase shift of quantum-well states by tailoring the interface electronic structure

Switching of magnetism via modifying phase shift of quantum-well states by tailoring the interface electronic structure

Appearance of ferromagnetism in Pt(100) ultrathin films originated from quantum-well states

The spin polarization of palladium on magneto-electric Cr2O3

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Product

Resources

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The spin polarization of palladium on magneto-electric Cr₂O₃