Single-Chain Magnets:Theoretical Approach and Experimental Systems

Coulon, C.; Miyasaka, Hitoshi; Clérac, Rodolphe

doi:10.1007/430_030

Cited by 583 publications

(369 citation statements)

References 75 publications

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“…As a consequence, CoPhOMe became the prototype of a class of magnetic chains where, by changing the metal or the radical moieties, it is now possible to fine-tune the physical properties. Because of the slow relaxation of its magnetization at low temperature, CoPhOMe was classified as a single-chain magnet (SCM), 9,10 in analogy with singlemolecule magnets (SMMs). 1,9,11 The magnetic properties of such 1D systems were theoretically predicted by Glauber in the 1960s: 12 At low temperature, the magnetization relaxes slowly with a relaxation time that follows an Arrhenius law s ¼ s 0 Áexp(D/k B T), and no phase transition to threedimensional (3D) magnetic long-range order occurs before the magnetization blockage.…”

Section: Introductionmentioning

confidence: 99%

“…1,9,11 The magnetic properties of such 1D systems were theoretically predicted by Glauber in the 1960s: 12 At low temperature, the magnetization relaxes slowly with a relaxation time that follows an Arrhenius law s ¼ s 0 Áexp(D/k B T), and no phase transition to threedimensional (3D) magnetic long-range order occurs before the magnetization blockage. 10,13 Subsequently, several other compounds were shown to exhibit SCM behavior, 11,[14][15][16][17][18][19][20][21] with quantum effects influencing the magnetization dynamics at low temperatures. 22 In particular, several works [23][24][25] showed that the requirements necessary to observe Glauber dynamics-a strong Ising-like anisotropy and a very low ratio of interchain/intrachain magnetic exchange interactions-are fulfilled in [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] (in short DyPhOPh).…”

Section: Introductionmentioning

confidence: 99%

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Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Arosio

Corti

Mariani

et al. 2015

Journal of Applied Physics

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Articles you may be interested inLocal spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A l 1 spin relaxation study The spin dynamics of the molecular magnetic chain [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] were investigated by means of the Muon Spin Relaxation (l þ SR) technique. This system consists of a magnetic lattice of alternating Dy(III) ions and radical spins, and exhibits single-chain-magnet behavior. The magnetic properties of [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] have been studied by measuring the magnetization vs. temperature at different applied magnetic fields (H ¼ 5, 3500, and 16500 Oe) and by performing l þ SR experiments vs. temperature in zero field and in a longitudinal applied magnetic field H ¼ 3500 Oe. The muon asymmetry P(t) was fitted by the sum of three components, two stretched-exponential decays with fast and intermediate relaxation times, and a third slow exponential decay. The temperature dependence of the spin dynamics has been determined by analyzing the muon longitudinal relaxation rate k interm (T), associated with the intermediate relaxing component. The experimental k interm (T) data were fitted with a corrected phenomenological BloembergenPurcell-Pound law by using a distribution of thermally activated correlation times, which average to s ¼ s 0 exp(D/k B T), corresponding to a distribution of energy barriers D. The correlation times can be associated with the spin freezing that occurs when the system condenses in the ground state. V C 2015 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Arosio

Corti

Mariani

et al. 2015

Journal of Applied Physics

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“…Using numerical and analytical calculations, we show that the so-called π/4 canted spin chain presents four stable magnetic domains with orthogonal magnetizations. Finally we show that domain walls, which are responsible for the relaxation of the magnetization (loss of information), have a finite energy which should avoid their nucleation at low temperature and therefore preserve the encoded information.Among the variety of low dimensionnal magnets, single chain magnets (SCMs) [7,8], have been extensively studied as they present a slow relaxation of magnetization, promising for information storage [7][8][9][10]. SCMs are generally made by assembling together single-molecule magnets that owns a strong uni-axial anisotropy [11].…”

mentioning

confidence: 99%

“…Among the variety of low dimensionnal magnets, single chain magnets (SCMs) [7,8], have been extensively studied as they present a slow relaxation of magnetization, promising for information storage [7][8][9][10]. SCMs are generally made by assembling together single-molecule magnets that owns a strong uni-axial anisotropy [11].…”

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confidence: 99%

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Magnetic tetrastability in a spin chain

Pianet¹,

Urdampilleta²,

Colin³

et al. 2016

Phys. Rev. B

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Bistability in magnetism has been extensively used, in particular to store information. Here we propose an alternative route by using tetrastable magnetic domains. Using numerical and analytical calculations we show that a spin chain with a canting angle of π/4 possesses four energy-equivalent states. We discuss the static properties of such chain such as the profile and the energy of the domain walls as they govern the relaxation of the magnetization. The realisation of such spin chain could enable the encoding of the information on four bits which is a potential alternative toward the increase of storage density.Spintronics using magnetic materials in electronic devices has made considerable progress from fundamental studies to practical applications [1]. This technology is based on the discovery of magnetoresistive effects, such as the giant magnetoresistance in ferromagnetic conductors. Nowadays these properties are mainly used for reading information encoded in the magnetic domains of a hard drive disk [2]. Depending on the relative magnetization orientation of the domains (either up or down), a drastic change of the electrical resistance is observed in the read-head. The constant reduction of the domain size, which slightly approaches the domain wall thickness, has almost reached its limit in standard inorganic magnetic materials. Moreover, as the domain size reduces, the anisotropy and therefore the bistability of such system decreases [3]. Hence, the challenge resides in finding new ways to store information on magnetic media. One of the approach consists in using alternative magnetic object such as molecular nanomagnets [4,5] or single atoms [6], which are the smallest magnetic domains that one can create.Here, we propose another strategy which consists in going beyond the traditional bistable storage of magnetic information. We propose to use spin chain that exhibits magnetic tetrastability, that enables encoding of information on four states, and should largely extend the storage density. Using numerical and analytical calculations, we show that the so-called π/4 canted spin chain presents four stable magnetic domains with orthogonal magnetizations. Finally we show that domain walls, which are responsible for the relaxation of the magnetization (loss of information), have a finite energy which should avoid their nucleation at low temperature and therefore preserve the encoded information.Among the variety of low dimensionnal magnets, single chain magnets (SCMs) [7,8], have been extensively studied as they present a slow relaxation of magnetization, promising for information storage [7][8][9][10]. SCMs are generally made by assembling together single-molecule magnets that owns a strong uni-axial anisotropy [11]. A SCM can be simply described by a chain of spins, as depicted in Fig.1a, with the following parameters: S is the amplitude of each spin, D is the on-site magnetic anisotropy, α is the canting angle between the easy axis of magnetization and the normal to the chain axis, J is the exchange inter...

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Constructing Magnetic Molecular Solids by Employing Three‐Atom Ligands as Bridges

Wang

Gao

2009

Design and Construction of Coordination Polymers

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The combination of some three-atom bridges with paramagnetic 3d transition metal ions results in the systematic isolation of molecular magnetic materials, ranging from single-molecule and singlechain magnets to layered weak ferromagnets and three-dimensional porous magnets. The design strategy and role of secondary components, such as co-ligands, templates and other mixed short ligands are discussed.

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Single-Chain Magnets:Theoretical Approach and Experimental Systems

Cited by 583 publications

References 75 publications

Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Magnetic tetrastability in a spin chain

Constructing Magnetic Molecular Solids by Employing Three‐Atom Ligands as Bridges

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