Role of Anisotropic Exchange Interactions in Determining the Properties of Spin-Glasses

Fert, A.; Levy, Peter M.

doi:10.1103/physrevlett.44.1538

Cited by 711 publications

(492 citation statements)

References 10 publications

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“…In this scenario, the magnetic correlations increase the coupling of the tunneling system and generate an orbital Kondo effect. In our study, the situation is different in that spin-dependent electron scattering causes some local groups of spins to change orientations with respect to the anisotropy field directions ͑such as triad anisotropy axes 32 ͒. Here, the energy difference between two local minima of spin configurations corresponds to spin splitting.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Effect of exchange bias on the electrical resistivity of Pd doped NiMn thin films: Two-channel Kondo system

Öner

Kamer

Ross

2006

Journal of Applied Physics

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Electrical resistivity measurements have been carried out for both flash-evaporated reentrant spin glasses ͑RSGs͒ ͑Ni 76−x Pd x ͒Mn 24 and Ni 74.5 Mn 23.5 Pd 2 , as well as Ni 75 Mn 23 Pd 2 , a pure SG. These measurements were carried out at temperatures down to 4 K. We observed a very deep resistivity minimum at about 75 K for Ni 74 Mn 24 Pd 2 . It was found previously ͓Öner et al., J. Appl. Phys. 89, 7044 ͑2001͔͒ that this sample shows the largest coercivity and exchange unidirectional anisotropy among these films. In addition, magnetization measurements show that this takes place just on the border of the RSG such that it could be handled as a superparamagnetic sample. Previously it was assumed that the exchange bias created in the sample between the domains plays the dominant role in the resistivity minimum. On the other hand, in order to account for the temperature dependence of the resistivity below the minimum we have analyzed these data using the Kondo, two-channel Kondo, weak localization, and Cochrane models for structural disorder based on the Anderson mechanism. We have deduced that the two-channel Kondo model gives the best agreement with the data; a logarithmic temperature dependence ⌬ ͑T͒ = ␤ log 10 ͑T / T K ͒, was observed at the temperatures below T f accompanied by a resistivity behavior ⌬ ͑T͒ = 0m ͑0͒͑1−␣T 1/2 ͒, at lower temperatures. All parameters deduced from the fitting correlate consistently with the strength of the exchange anisotropy and coercivity in the RSG films, and thus provide a separate measure of the presence of antiferromagnetically coupled domains in these materials.

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Section: Analysis and Discussionmentioning

confidence: 99%

Effect of exchange bias on the electrical resistivity of Pd doped NiMn thin films: Two-channel Kondo system

Öner

Kamer

Ross

2006

Journal of Applied Physics

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“…Owing to the broken inversion symmetry at an interface, SOC induces the DM interaction [24][25][26][27] , which can lead to a canting of the magnetic moments of the atoms. For spin spiral states, one obtains an additional energy contribution that is linear in q close to the ferromagnetic state and due to symmetry lowers the energy only for cycloidal spirals with a unique rotational sense 27 ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A key ingredient to the existence of magnetic skyrmion lattices is the DM interaction [24][25][26] , which results from spin-orbit coupling (SOC) in a structure without inversion symmetry such as a chiral crystal structure [5][6][7][8][9][10] or a surface 27 . Recently, a nanoskyrmion lattice has been reported as the magnetic ground state in an ultra-thin magnetic Fe film on Ir(111) (ref.…”

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confidence: 99%

Tailoring magnetic skyrmions in ultra-thin transition metal films

et al. 2014

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Skyrmions in magnetic materials offer attractive perspectives for future spintronic applications since they are topologically stabilized spin structures on the nanometre scale, which can be manipulated with electric current densities that are by orders of magnitude lower than those required for moving domain walls. So far, they were restricted to bulk magnets with a particular chiral crystal symmetry greatly limiting the number of available systems and the adjustability of their properties. Recently, it has been experimentally discovered that magnetic skyrmion phases can also occur in ultra-thin transition metal films at surfaces. Here we present an understanding of skyrmions in such systems based on first-principles electronic structure theory. We demonstrate that the properties of magnetic skyrmions at transition metal interfaces such as their diameter and their stability can be tuned by the structure and composition of the interface and that a description beyond a micromagnetic model is required in such systems.

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“…A numerical study also predicts that introducing chirality of Bloch walls into magnetic films can extend possibilities to manipulate DW propagation behaviours to new geometries 18 . Developing experimental evidence that allows us to tailor the spin structure of chiral DWs via interfacial DMI 6,22 is crucial for engineering methods to control current-or field-driven DW dynamics in film and multilayer structures, since these phenomena hold great potential for information storage and spintronics. In particular, direct observations of DW spin structure under the combined effects of interfacial DMI and in-plane uniaxial anisotropy are still missing.…”

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confidence: 99%

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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Chiral magnetic domain walls are of great interest because lifting the energetic degeneracy of left-and right-handed spin textures in magnetic domain walls enables fast current-driven domain wall propagation. Although two types of magnetic domain walls are known to exist in magnetic thin films, Bloch-and Néel-walls, up to now the stabilization of homochirality was restricted to Néel-type domain walls. Since the driving mechanism of thin-film magnetic chirality, the interfacial Dzyaloshinskii-Moriya interaction, is thought to vanish in Bloch-type walls, homochiral Bloch walls have remained elusive. Here we use real-space imaging of the spin texture in iron/nickel bilayers on tungsten to show that chiral domain walls of mixed Bloch-type and Néel-type can indeed be stabilized by adding uniaxial strain in the presence of interfacial Dzyaloshinskii-Moriya interaction. Our findings introduce Bloch-type chirality as a new spin texture, which may open up new opportunities to design spin-orbitronics devices.

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Role of Anisotropic Exchange Interactions in Determining the Properties of Spin-Glasses

Cited by 711 publications

References 10 publications

Effect of exchange bias on the electrical resistivity of Pd doped NiMn thin films: Two-channel Kondo system

Effect of exchange bias on the electrical resistivity of Pd doped NiMn thin films: Two-channel Kondo system

Tailoring magnetic skyrmions in ultra-thin transition metal films

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

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