Domains in perpendicularly magnetized ultrathin films studied using the magnetic susceptibility

Venus, D.; Arnold, Christophe; Dunlavy, M. J.

doi:10.1103/physrevb.60.9607

Cited by 23 publications

(23 citation statements)

References 41 publications

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“…In addition to these basic structural and electronic studies of Ni/W(110), the chemical and catalytic properties of this interface have been extensively investigated [4,11,[22][23][24][25][26][27]. There have also been numerous measurements of the magnetic properties of Ni/W(110) thin films [28][29][30][31][32][33], which have been extended to epitaxial Fe films grown on Ni/W(110) [36][37][38][39][40][41]. Femtosecond electron dynamics in Ni/W(110) films have also been investigated [34,35].…”

Section: Introductionmentioning

confidence: 99%

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

et al. 2008

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We have measured W 4f 7/2 core-level photoemission spectra from W(110) in the presence of Ni overlayers, from ∼0.2 to ∼3 monolayers. Interfacial core-level shifts associated with first-layer Ni phases have been identified: −230 ± 15 meV for the 1×1 pseudomorphic phase and −70 ± 7 meV for the 7×1 close-packed commensurate phase. At higher Ni coverages the interfacial core-level shift is −100 ± 10 meV. These shifts are analyzed using the partial-shift model of Nilsson et al. [Phys. Rev. B 38 (1988) 10357]; the analysis indicates that the difference in binding energies between the 1×1 and 7×1 phases has a large contribution from structural differences between the two phases.

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Section: Introductionmentioning

confidence: 99%

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

et al. 2008

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“…2,3 This report concentrates on the effect of surface roughness and interface mixing on the formation and motion of domain walls in Fe films grown on a 2 ML Ni/W͑110͒ substrate. Previous results 16 have shown that the low frequency ac magnetic susceptibility of these films is dominated by the response of the domain walls. The temperature-dependent measurements may be analyzed quantitatively to yield the activation energy for domain wall motion, the mean domain pinning length, and the temperature-dependent rate of domain formation.…”

Section: Introductionmentioning

confidence: 77%

“…In measurements of the magnetic susceptibility, a magnetic field is applied at a frequency but the walls do not respond instantaneously. Assuming that the magnetization responds linearly to the departure from equilibrium yields 16,17 ͑T ͒ϭ 1Ϫi͑T ͒…”

Section: The Contribution Of Domain Wall Motion To the Magnetic Smentioning

confidence: 99%

“…2 Recent studies of perpendicularly-magnetized films have characterized the domains using hysteresis loops, [6][7][8] spatial images of the domains, [9][10][11][12] magnetic relaxation, 13,14 and the magnetic susceptibility. [15][16][17] A number of theoretical papers have investigated the link between the domain properties and the fine structure of the film, with particular emphasis on film roughness. [18][19][20] Others have linked domain formation in these systems to both the transition from ferromagnetism to paramagnetism 21 and the spin reorientation transition.…”

Section: Introductionmentioning

confidence: 99%

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Relation of domain properties to structural changes in perpendicularly magnetized ultrathin films

Dunlavy

Venus

2000

Phys. Rev. B

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The influence of interface mixing upon the magnetic domain properties in perpendicularly magnetized ultrathin films has been studied using Fe/2 ML Ni/W͑110͒ samples. Annealing of films with an Fe thickness of 1-1.5 ML produces interface mixing that can be quantified using Auger electron spectroscopy, and related to the changes in domain properties ͑such as the activation energy for domain wall pinning, the domain correlation length, and domain concentration͒ as measured by the low frequency ac magnetic susceptibility. Analysis of the susceptibility, as well as model calculations of the magnetic anisotropy, suggest that pinning is caused by the perturbation of the domain wall energy by monolayer steps in thickness. Initially, annealing smooths the film, thus increasing the domain correlation length and activation energy. Further annealing causes mixing at the Fe/Ni interface, which reduces the anisotropy, thus reducing the activation energy and increasing the domain concentration. Annealing above 550 K breaks up the film and there is no magnetic response in the measurable temperature range.

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“…Among the different experimental methods the measurement of the susceptibility χ(T ) is a very powerful method for the analysis of thin film systems [1,2]. The maximum of the susceptibility corresponds to the occurrence of a nonvanishing magnetization for the temperatures below the Curie temperature T C .…”

Section: Model and Methodsmentioning

confidence: 99%

Parallel Susceptibility of Thin Ferromagnetic Films within Many-Body Green's Function Theory

Ilkovič

Kecer

2008

Acta Phys. Pol. A

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Parallel susceptibility of the quantum Blume-Capel model for ferromagnetic films is calculated within the Green function theory. The Hamiltonian includes a Heisenberg term with the different surface exchange coupling with respect to bulk, an external magnetic field, a second-order uniaxial single-ion anisotropy, and the exchange anisotropy. The importance of collective excitations is demonstrated by comparing with result calculated within mean field approximation.

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Domains in perpendicularly magnetized ultrathin films studied using the magnetic susceptibility

Cited by 23 publications

References 41 publications

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

Relation of domain properties to structural changes in perpendicularly magnetized ultrathin films

Parallel Susceptibility of Thin Ferromagnetic Films within Many-Body Green's Function Theory

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