Three-configurational surface magneto-optical Kerr effect measurement system for an ultrahigh vacuum <i>in situ</i> study of ultrathin magnetic films

Lee, J.-W.; Jeong, Jong‐Ryul; Kim, D.-H.; Ahn, Jae-Hyun; Kim, J.; Shin, Sung‐Chul

doi:10.1063/1.1310346

Cited by 36 publications

(8 citation statements)

References 11 publications

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“…The coercive field is 0 H c =7Ϯ 1 mT. The shape of this curve is not the expected square shape and resembles the one reported equally for transverse MOKE by Lee et al 54 An STM image of the continuous film is shown in Fig. 4͑c͒.…”

Section: Moke Of 1 ML Granular and Continuous Filmsmentioning

confidence: 69%

Magnetic anisotropy of Fe and Co ultrathin films deposited on Rh(111) and Pt(111) substrates: An experimental and first-principles investigation

et al. 2010

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We report on a combined experimental and theoretical investigation of the magnetic anisotropy of Fe and Co ultrathin layers on strongly polarizable metal substrates. Monolayer ͑ML͒ films of Co and Fe on Rh͑111͒ have been investigated in situ by x-ray magnetic circular dichroism ͑XMCD͒, magneto-optic Kerr effect, and scanning tunneling microscopy. The experiments show that both magnetic adlayers exhibit ferromagnetic order and enhanced spin and orbital moments compared to the bulk metals. The easy magnetization axis of 1 ML Co was found to be in plane, in contrast to Co/Pt͑111͒, and that of 1 ML Fe out of plane. The magnetic anisotropy energy ͑MAE͒ derived from the magnetization curves of the Fe and Co films is one order of magnitude larger than the respective bulk values. XMCD spectra measured at the Rh M 2,3 edges evidence significant magnetic polarization of the Rh͑111͒ surface with the induced magnetization closely following that of the overlayer during the reversal process. The easy axis of 1-3 ML Co/Rh͑111͒ shows an oscillatory in-plane/out-of-plane behavior due to the competition between dipolar and crystalline MAE. We present a comprehensive theoretical treatment of the magnetic anisotropy of Fe and Co layers on Rh͑111͒ and Pt͑111͒ substrates. For free-standing hexagonally close-packed monolayers the MAE is in plane for Co and out of plane for Fe. The interaction with the substrate inverts the sign of the electronic contribution to the MAE, except for Fe/Rh͑111͒, where the MAE is only strongly reduced. For Co/Rh͑111͒, the dipolar contribution outweighs the band contribution, resulting in an in-plane MAE in agreement with experiment while for Co/Pt͑111͒ the larger band contribution dominates, resulting in an out-of-plane MAE. For Fe films however, the calculations predict for both substrates an in-plane anisotropy in contradiction to the experiment. At least for Fe/Pt͑111͒ comparison of theory and experiment suggests that the magnetic structure of the adlayer is more complex than the homogenous ferromagnetic order assumed in the calculations. The angular momentum and layer-resolved contributions of the overlayer and substrate to the MAE and orbital moment anisotropy are discussed with respect to the anisotropic hybridization of the 3d, 4d, and 5d electron states and vertical relaxation. The role of technically relevant parameters such as the thickness of the surface slab, density of k points in the Brillouin zone, and electron-density functionals is carefully analyzed.

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Section: Moke Of 1 ML Granular and Continuous Filmsmentioning

confidence: 69%

Magnetic anisotropy of Fe and Co ultrathin films deposited on Rh(111) and Pt(111) substrates: An experimental and first-principles investigation

et al. 2010

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“…3(a) and (b). Whereas the Kerr rotation and ellipticity were simultaneously observed, here, we show the longitudinal ellipticity and polar rotation loops since their different sensitivities to the magnetization components of the in-plane and normal-to-plane directions [10], [11]. In these loop measurements, the plane of incidence and the field direction lie perpendicular to the long direction of the Pt electrodes shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

Voltage Control of Magnetization Easy-Axes: A Potential Candidate for Spin Switching in Future Ultrahigh-Density Nonvolatile Magnetic Random Access Memory

Kim

Shin²,

No³

2004

IEEE Trans. Magn.

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We report a challenging attempt to switch magnetization directions in ferromagnetic films by applying a voltage instead of an external magnetic field. As an example, a voltage control of magnetization easy-axes in a newly developed hybrid system of ferromagnetic/piezoelectric films has been demonstrated by using the well-known effects of both the inverse magnetostriction of ferromagnetic CoPd alloys and the inverse piezoelectricity of lead-zirconate-titanate alloy films. This information-storage and writing method suitable for use in an ultrahigh-density nonvolatile magnetic random access memory may prove to be a new paradigm in information-storage technology.Index Terms-Controllable spin switching, CoPd/PZT hybrid, magnetostrictive effect, piezoelectric effect, voltage control.

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“…The Pd (111) substrate was cleaned by several cycling of sputtering with Ar ion of a 1 keV energy followed by annealing at 900 K. A well-formed terrace structure of the Pd (111) surface was confirmed by STM study. Details of the SMOKE measurement system were described elsewhere [11].…”

Section: Methodsmentioning

confidence: 99%

In situ vectorial magnetization study of ultrathin magnetic films using a surface magneto-optical Kerr effect measurement system

Lee

Kim²,

Jeong³

et al. 2001

IEEE Trans. Magn.

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The three-configuration in situ surface magneto-optical Kerr effect (SMOKE) system, which enables full vectorial analysis of magnetization for ultrathin magnetic films in a UHV chamber, has been developed. The system has been applied to in situ measurements of the three components of magnetization vector of Co films in an applied magnetic field at the thickness range of 5 6 ML, where the spin reorientation was found to occur. We observed contrasting vectorial magnetization reversal behavior dependent on the Co thickness: In particular, for 5.25 ML of Co, a slightly canted magnetization vector from the film normal rotates in the film plane under an applied field normal to the film plane.

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Three-configurational surface magneto-optical Kerr effect measurement system for an ultrahigh vacuum in situ study of ultrathin magnetic films

Cited by 36 publications

References 11 publications

Magnetic anisotropy of Fe and Co ultrathin films deposited on Rh(111) and Pt(111) substrates: An experimental and first-principles investigation

Magnetic anisotropy of Fe and Co ultrathin films deposited on Rh(111) and Pt(111) substrates: An experimental and first-principles investigation

Voltage Control of Magnetization Easy-Axes: A Potential Candidate for Spin Switching in Future Ultrahigh-Density Nonvolatile Magnetic Random Access Memory

In situ vectorial magnetization study of ultrathin magnetic films using a surface magneto-optical Kerr effect measurement system

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