Morphology and magnetic properties of submonolayer Gd films

Gajdzik, Martin; Trappmann, T.; Sürgers, Christoph; Löhneysen, H. v.

doi:10.1103/physrevb.57.3525

Cited by 33 publications

(16 citation statements)

References 42 publications

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“…[1][2][3][4] Present research and open problems address, e.g., the temperature dependence of the exchange splitting of Gd 5 and Tb 6 surface states, the critical behaviour, 7-9 the origin of magnetic anisotropy 10 and the electronic band structure [11][12][13] of Gd, the influence of film thickness on the critical behaviour of Gd and Ho films, [14][15][16] the issue of field-induced chirality in the helix structure of Dy/Y multilayers, 17 or the field-dependent magnetic ordering in Eu films.…”

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confidence: 99%

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

et al. 2011

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We report on the results of grain-size and temperature-dependent magnetization, specific-heat, and neutron-scattering experiments on the heavy rare-earth metals terbium and holmium, with particular emphasis on the temperature regions where the helical antiferromagnetic phases exist. In contrast to Ho, we find that the helical structure in Tb is relative strongly affected by microstructural disorder, specifically, it can no longer be detected for the smallest studied grain size of D = 18 nm. Moreover, in coarse-grained Tb a helical structure persists even in the ferromagnetic regime, down to about T = 215 K, in agreement with angle-resolved photoelectron spectroscopy (ARPES) data, which reveal a nesting feature of the bulk Fermi surface at the L point of the Brillouin zone at T = 210 K. As samples for the ARPES measurements, we used 10-nm-thick single-crystalline Tb films that show a bulk electronic valance-band structure. Thus, our ARPES measurements are used to discuss temperature-induced effects observed in the coarse-grained samples.

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confidence: 99%

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

et al. 2011

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“…T c (D) functions of Fe, Co, and Ni transition nanocrystals, rare-earth nanometals like Gd and Tb, and their alloys and compounds have been investigated experimentally. Commonly, the monolayer or multilayer magnetic films are epitaxially grown on or between nonmagnetic materials like noble metals, nonmagnetic transition metals, semiconductors, as well as insulator substrates, such as Fe/SiO [93], Fe/Cu(001) [94], Fe/Ag(001) [94] [107], and Gd/Y(0001) [108] systems. Other low-dimensional nanocrystals, i.e.…”

Section: Experiments Resultsmentioning

confidence: 99%

“…The change tendencies are the same. (35) with J s J i and J sub 0 for epitaxial films on magnetic inert substrates, the symbols [105], [105], [106], [107], [107], [108] denote the experimental measurements of Gd/W(110), Gd/W, Nb/Gd and Gd/Y(0001) epitaxial films; [112] Table 2. -( s + i -2).…”

Section: Verification Of T C (D) Functionmentioning

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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“…(26) and the experimental data. The wide distribution of the T cm (D) of Gd nanocrystals indicates that the T cm (D) of Gd is strongly dependent on the film's morphology [30], as well as on the lattice misfit between Gd film and the substrate [27]. For simplicity, these factors are neglected in this model, which does not bring out a big error.…”

Section: Ordering Temperatures Of Fm and Afm Nanocrystalsmentioning

confidence: 98%

“…Prominent examples are the Fe/SiO [15], Fe/Ag(001) [16], Fe/Au(100) [17], Fe/Pd(100) [18], Fe/Ag (111) [19], Fe/Ag(100) [20], Co/Cu(100) [21], Co/Cu (111) [22,23], Co/Cu(001) [23,24], Ni/Cu(100) [23], Ni/Cu(001) [24], Ni/Cu (111) [25], Ni/W (110) [26], Co 1 Ni 1 /Cu(100) [23], Co 1 Ni 3 /Cu(100) [23], Co 1 Ni 9 /Cu(100) [23], Gd/W (110) [27], Gd/W [28], Nb/Gd [29], and Gd/Y(0001) [30] systems, and other low-dimensional nanocrystals, i.e., Ni nanorods [31,32] and nanoparticles [32,33], Gd [34], Fe 3 O 4 [35], and MnFe 2 O 4 [36] nanoparticles. Interest in the thin films, superlattices, nanoparticles and nanorods of AFM insulators has grown for both fundamental studies and device application, as in the example of Ho/Nb/Y, Ho/Y/Nb [37], CoO/SiO 2 [38,39], CoO/MgO [40], CoO/NiO [40], CoO/Fe 3 O 4 [41], NiO/MgO [40,42] thin films and CuO nanoparticles [43−46] and nanorods [46].…”

Section: Ordering Temperature Of Fm and Afm Nanocrystalsmentioning

confidence: 99%

Size dependence of phase transition temperatures of ferromagnetic, ferroelectric and superconductive nanocrystals

Lang

Jiang

2007

Front. Phys. China

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With the miniaturization of devices, size and interface effects become increasingly important for the properties and performances of nanomaterials. Here, we present a thermodynamic approach to the mechanism behind size-induced unusual behavior in the phase stabilities of ferromagnetic (FM), antiferromagnetic (AFM), ferroelectric (FE), and superconductive (SC) nanocrystals, which are different dramatically from their bulk counterparts. This method is based on the Lindemann criterion for melting, Mott's expression for the vibrational melting entropy, and the Shi model for the size-dependent melting temperature. Simple and unified functions, without any adjustable parameter, are established for the size and interface dependences of thermal and phase stabilities of FM, AFM, FE and SC nanocrystals. According to these analytic functions, as the size of nanocrystals is reduced, the thermal and phase stabilities may strengthen or weaken, depending on the confluence of the surface/volume ratio of nanocrystals and the FM(AFM, FE or SC)/substrate interface situations. The validity of this model is confirmed by a large number of experimental results. This theory will be significant for the choice of materials and the design of devices for practical application.

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Morphology and magnetic properties of submonolayer Gd films

Cited by 33 publications

References 42 publications

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

Size Dependence of Structures and Properties of Magnetic Materials

Size dependence of phase transition temperatures of ferromagnetic, ferroelectric and superconductive nanocrystals

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