Magneto-optical Kerr effect study of ac susceptibilities in ultrathin cobalt films

Berger, Andreas; Knappmann, S.; Oepen, H. P.

doi:10.1063/1.355653

Cited by 41 publications

(14 citation statements)

References 13 publications

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“…The maximum field which could be applied was 1050 Oe. The dependence of the susceptibility on temperature was measured according to Berger et al 14 to determine the Curie temperature.…”

Section: Methodsmentioning

confidence: 99%

Magnetism, structure, and morphology of ultrathin Fe films onCu3Au(100)

Feldmann¹,

et al. 1998

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The magnetic, structural, and morphological properties of ultrathin Fe films on Cu 3 Au͑100͒ have been investigated by low-energy electron diffraction including I/V measurements, Auger electron spectroscopy, medium-energy electron diffraction, and magneto-optic Kerr effect. The main aim of these studies was to establish the correlation between film structure and magnetism. For this purpose both films deposited at 300 K ͑RT͒ and at 150 K ͑LT͒ followed by subsequent annealing to 300 K were investigated. Above about 1 monolayer ͑ML͒, the films exhibit a perpendicular magnetization, which switches at 3.2Ϯ0.2 ML for LT and 2.3Ϯ0.2 ML for RT films in-plane. The reduction of the switching thickness from perpendicular to in-plane with growth temperature is caused by an interdiffusion at the Fe film/substrate interface. At somewhat larger thickness a structural transition is observed. This structural transition is not related to the magnetic reorientation. Contrary to other studies no evidence is found for any fcc iron modification. We rather conclude that above 5 ML, the iron film transforms from strained to unstrained bcc͑100͒ Fe.

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“…The maximum field which could be applied was 1050 Oe. The dependence of the susceptibility on temperature was measured according to Berger et al 14 to determine the Curie temperature.…”

Section: Methodsmentioning

confidence: 99%

Magnetism, structure, and morphology of ultrathin Fe films onCu3Au(100)

Feldmann¹,

et al. 1998

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“…13,14,15 Hysteresis loops were obtained in static magnetic fields up to B ∼ 30 mT. With the same optical setup the magnetic susceptibility χ(T ) was studied.…”

Section: Experimental Aspectsmentioning

confidence: 99%

“…No additional bias fields were used, hence the zero field ac susceptibility is measured. 13 In this paper we monitor the static susceptibility, which is obtained for sufficiently low magnetic fields and frequencies. The modulation frequency was set to approximately 110 Hz, while the modulation amplitude B mod has been varied on purpose.…”

Section: Experimental Aspectsmentioning

confidence: 99%

Anisotropic susceptibility of ferromagnetic ultrathin Co films on vicinal Cu

et al. 2003

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We measure the magnetic susceptibility of ultrathin Co films with an in-plane uniaxial magnetic anisotropy grown on a vicinal Cu substrate. Above the Curie temperature the influence of the magnetic anisotropy can be investigated by means of the parallel and transverse susceptibilities along the easy and hard axes. By comparison with a theoretical analysis of the susceptibilities we determine the isotropic exchange interaction and the magnetic anisotropy. These calculations are performed in the framework of a Heisenberg model by means of a many-body Green's function method, since collective magnetic excitations are very important in two-dimensional magnets.

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“…21 Magneto-optical Kerr effect susceptometry is a versatile tool in modern magnetics materials research. This ac technique, which combines ease of implementation, low cost, and high sensitivity, has been utilized in studies on magnetic phase transitions [22][23][24] and magnetic domain responses 25,26 in thin and ultra-thin magnetic films. Moreover, it has been shown that the imaginary Kerr signal provides additional information on energy absorption in magnetic systems.…”

Section: Introductionmentioning

confidence: 99%