Polar Kerr-Effect Observation of Perpendicular Surface Anisotropy for Ultrathin fcc Fe Grown on Cu(100)

Liu, C.; Moog, E. R.; Bader, S. D.

doi:10.1103/physrevlett.60.2422

Cited by 308 publications

(77 citation statements)

References 13 publications

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“…In particular, thin magnetic films and multilayers exhibit a rich variety of properties not previously found in bulk magnetism such as enhanced or reduced moments [2], oscillatory exchange coupling through nonmagnetic spacers [3][4][5], giant magnetoresistance [6,7], and the reorientation of the magnetic easy axis upon thickness and temperature variation [8][9][10][11]. Especially the observation of spin-polarized quantum well states (QWS) [12][13][14][15] in Cu/Co (001) has attracted a great deal of attention.…”

Section: Typeset Using Revt E Xmentioning

confidence: 99%

Theory for Spin-Polarized Oscillations in Nonlinear Optics due to Quantum Well States

Luce

Hübner

1996

Phys. Rev. Lett.

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Using an electronic tight-binding theory we calculate the nonlinear magneto-optical response from an x-Cu/1Fe/Cu(001) film as a function of frequency and Cu overlayer thickness (x=3. . .25). We find very strong spinpolarized quantum well oscillations in the nonlinear magneto-optical Kerr effect (NOLIMOKE). These are enhanced by the large density of Fe d states close to the Fermi level acting as intermediate states for frequency doubling.In good agreement with experiment we find two oscillation periods of 6-7 and 11 monolayers the latter being more pronounced. Typeset using REVT E X 1The magnetism of low-dimensional metallic structures such as surfaces, thin films, and multilayer sandwiches has recently become an exciting new field of research and applications [1]. In particular, thin magnetic films and multilayers exhibit a rich variety of properties not previously found in bulk magnetism such as enhanced or reduced moments [2], oscillatory exchange coupling through nonmagnetic spacers [3][4][5], giant magnetoresistance [6,7], and the reorientation of the magnetic easy axis upon thickness and temperature variation [8][9][10][11]. Especially the observation of spin-polarized quantum well states (QWS) [12][13][14][15] in Cu/Co (001) has attracted a great deal of attention. It has become clear that quantum well states are indeed responsible for the important oscillatory behavior of the exchange coupling of ferromagnetic thin films via nonmagnetic spacers [16,17]. Presently mainly photoemission (PE) and inverse photoemission (IPE) [12][13][14][15] have been used to identify QWS effects. Very recently a possible connection between thickness dependent changes in NOLIMOKE and QWS [18] has been proposed.It is the goal of this Letter to show that also nonlinear optics, in particular NOLIMOKE, is a new sensitive tool for studying QWS. We find very interesting structure in the NO-LIMOKE signal due to particular transitions in k-space. This is very remarkable since it indicates that NOLIMOKE is able to detect very sensitively k-dependent structures. This new effect seems to be of general interest for the physics of nonlinear optics and its relationship to the underlying electronic structure. Note, this is not the case for linear optics, since there the contribution of the Drude term of the dielectric function creates a strong background of transitions from all k-directions. Nonlinear optics, in contrast to linear op-

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Section: Typeset Using Revt E Xmentioning

confidence: 99%

Theory for Spin-Polarized Oscillations in Nonlinear Optics due to Quantum Well States

Luce

Hübner

1996

Phys. Rev. Lett.

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“…Since the first observation of SRT by Gradmann and Müller [182], a large number of related experimental investigations, such as Fe/Cu(100) [183,184], Fe/Cu/Si(111) [185], Fe/Cu(001) [186,187], Fe/Ag(001) [97,188], Fe/Cr(110) [167], Fe/Si(111) [189], and Co/Au(111) [190,191], Co/Pd(111) [192], Co/Pt(111) [192], Co/W(110) [193] thin films showing the polar SRT, m m , and Ni/Cu(001) [194,195] exhibiting the reversed polar SRT m m with increasing T and D, where m and m denote the perpendicular and in-plane magnetic directions. Calculations based on the mean-field and perturbation theory [196,197] have described successfully this SRT.…”

Section: When Films Have the Same Two Surfaces Or Interfaces Eq (46mentioning

confidence: 99%

Size Dependence of Structures and Properties of Magnetic Materials

Jiang¹,

Lang²

2007

TONANOJ

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Due to the involvement of high portion of atomic coordination imperfection in surfaces and interfaces, the properties of magnetic nanocrystals dramatically differ from that of the corresponding bulk counterparts, which have led to a surge in both experimental and theoretical investigations in the past decades. This review summarizes the studies for these size-dependent magnetic properties, and additional thermal or phase stabilities, and mechanical properties. To interpret the above phenomena, a thermodynamic model for the size dependence and interface dependences of these properties is described, which is based on Lindemann s criterion for melting, Mott s expression for the vibrational melting entropy, and Shi s model for the size-dependent melting temperature. The model without any adjustable parameter is confirmed by a large number of experimental results, and helps us to understand the structures and properties of the magnetic nanocrystals. Moreover, other theoretical works on the above properties are also mentioned and commented.

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“…A surface breaks the translation symmetry of a system and changes local quantities such as local density of states (LDOS) which is significantly different from the bulk density of states (DOS). Experimental study on magnetic surfaces has shown that the order-disorder phase transitions are affected by the surfaces and may differ markedly from that in the bulk 2,3,4,5,6 . Indeed, the atoms at the surface layer have fewer neighboring atoms in comparison with the bulk, and it is well know that the magnetic order is strongly modified due to the lower coordination number.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of surface magnetization in local-moment systems

Saffarzadeh

2006

Surface Science

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We present a theory to study the temperature-dependent behavior of surface states in a ferromagnetic semi-infinite crystal. Our approach is based on the single-site approximation for the s-f model. The effect of the semi-infinite nature of the crystal is taken into account by a localized perturbation method. Using the mean-field theory for the layer-dependent magnetization, the local density of states and the electron-spin polarization are investigated at different temperatures for ordinary and surface transition cases. The results show that the surface magnetic properties may differ strongly from those in the bulk and the coupling constant of atoms plays a decisive role in the degree of spin polarization. In particular, for the case in which the exchange coupling constant on the surface and between atoms in the first and second layer is higher than the corresponding in the bulk, an enhancement of surface Curie temperature and hence the spin polarization can be obtained.

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Polar Kerr-Effect Observation of Perpendicular Surface Anisotropy for Ultrathin fcc Fe Grown on Cu(100)

Cited by 308 publications

References 13 publications

Theory for Spin-Polarized Oscillations in Nonlinear Optics due to Quantum Well States

Theory for Spin-Polarized Oscillations in Nonlinear Optics due to Quantum Well States

Size Dependence of Structures and Properties of Magnetic Materials

Temperature dependence of surface magnetization in local-moment systems

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