Finite size scaling in the thin film limit

Waldfried, Carlo; Welipitiya, D.; McAvoy, T.; Dowben, Peter A.; Vescovo, E.

doi:10.1063/1.367909

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…For thin iron films [60], phenomenological finite-size scaling analysis yields an effective shift exponent λ = 3.15 which is twice as large as the value expected from the conventional finite-size scaling prediction [51] whereas for amorphous iron and aluminum films [61] λ = 1.2 were found. Furthermore, thickness dependent crossover of the exponent λ was also observed for gadolinium films in the formalism of finite size scaling [62].…”

Section: Introductionmentioning

confidence: 76%

Thickness dependent Curie temperature and power-law behavior of layering transitions in ferromagnetic classical and quantum thin films described by Ising, XY and Heisenberg models

Yüksel

Akıncı

2015

Physica B: Condensed Matter

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Ferromagnetic-paramagnetic phase transitions in classical and quantum thin films have been studied up to 50 monolayers using effective field theory with two-site cluster approximation. Variation of the Curie temperature as a function of film thickness has been examined. The relative shift of the Curie temperature from the corresponding bulk value has been investigated in terms of the shift exponent λ. We have found that shift exponent λ clearly depends on the strength of the ferromagnetic exchange coupling of the surface. Moreover, we have not observed any significant difference between classical and quantum exponents for a particular model.

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Section: Introductionmentioning

confidence: 76%

Thickness dependent Curie temperature and power-law behavior of layering transitions in ferromagnetic classical and quantum thin films described by Ising, XY and Heisenberg models

Yüksel

Akıncı

2015

Physica B: Condensed Matter

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“…In the past decades, a lot of effort has been put into the research of magnetic materials, including finite size scaling of ferromagnetism in thin films (see, e.g., Refs. [29][30][31]). These materials require a supporting substrate to ensure structural stability.…”

Section: Gpa (W/o Vdw)mentioning

confidence: 99%

Ferromagnetic two-dimensional crystals: Single layers of K2CuF4

et al. 2013

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The successful isolation of graphene ten years ago has evoked a rapidly growing scientific interest in the nature of two-dimensional (2D) crystals. A number of different 2D crystals has been produced since then, with properties ranging from superconductivity to insulating behavior. Here, we predict the possibility for realizing ferromagnetic 2D crystals by exfoliating atomically thin films of K2CuF4. From a first-principles theoretical analysis, we find that single layers of K2CuF4 form exactly 2D Kosterlitz-Thouless systems. The 2D crystal can form a free-standing membrane, and exhibits an experimentally accessible transition temperature and robust magnetic moments of 1µB per formula unit. 2D K2CuF4 unites ferromagnetic and insulating properties and is a demonstration of principles for nanoelectronics such as novel 2D-based heterostructures.Introduction The large variety of two-dimensional (2D) atomic crystals which are available to us [1, 2] comprise into a very rich class of materials, which collectively covers a large diversity of properties. Also, the recent progress in creating heterostructures made from individual atomic crystals [3][4][5] allowed the investigation of such phenomena as Coulomb drag [6] and the Hofstadter butterfly [7][8][9], but also facilitated the creation of novel, often multifunctional devices, such as tunneling transistors [10,11] and photovoltaic devices [12][13][14].

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