New Mechanism of Anisotropic Superexchange Interaction

Moriya, Tôru

doi:10.1103/physrevlett.4.228

Cited by 1,261 publications

(820 citation statements)

References 7 publications

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“…We note that the lower blocking temperature for Ferritin II than that for PIC, even though K(Ferritin II);;:: K(PIC), is due to that KV for Ferritin II is still smaller than the comparable value for PIC due to the latter's larger volume. From either the pair or single-ion model of magnetic anisotropy [48][49][50][51][52][53][54] it is apparent how Fe 2 + ions bonding to the surface of the Ferritin II core would increase the magnetic anisotropy of the particle, however, such Fe2+ ions may prevent the occurrence of the spin-canting or the 'extremity moments' of Neel, i.e. the magnetostatic couple produced by such antiferromagnetic particles' surfaces in a mag netic field, which gives rise to the superantiferro magnetic effect.…”

Section: Discussionmentioning

confidence: 99%

A comparison of the magnetic properties of polysaccharide iron complex (PIC) and ferritin

Mohie-Eldin

Frankel

Gunther

1994

Journal of Magnetism and Magnetic Materials

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The synthetic polysaccharide iron complex (PIC) molecule has been suggested as a 'biomimic', i.e. a counterpart, to the naturally occurring biological molecule ferritin with respect to its magnetic properties based on the identification of ferrihydrite as the major mineral in both. Magnetization measurements were used to investigate the magnetic properties of PIC in relation to those of ferritin, as well as to identify differences in such properties between naturally occurring ferritin, which we designate here as Ferritin-I, and ferritin with an artificially high content of Fe 2 + ions bound to its core, which is designated here as Ferritin II. The anisotropy constants K, blocking temperatures TB' magnetic moments m per particle, and number of magnetic moments 'spins' per particle-N sp were found to fit the following relations for PIC and ferritin: K(Ferritin I) < K(PIC) ::s; K(Ferritin 11), TB(FerritinThe magnetic moment per Fe ion was found to be smaller in PIC than Ferritin II due to a stronger antiferromag netic interaction between the Fe ions of PIC. Susceptibility measurements indicated the existence of superantiferro magnetism in PIC and Ferritin I and also showed that most Fe 2 + ions in Ferritin II are bound to its core surface. The enhanced values of K and TB as well as the reduced effect of superantiferromagnetism and the antiferromag netic interaction between the molecules at low temperatures for the Ferritin II indicates the importance of the surface magnetic moments in dominating the magnetic behavior of both PIC and femtin (Ferritin I).

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Section: Discussionmentioning

confidence: 99%

A comparison of the magnetic properties of polysaccharide iron complex (PIC) and ferritin

Mohie-Eldin

Frankel

Gunther

1994

Journal of Magnetism and Magnetic Materials

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“…In order to determine the magnitude of t F and t T , it is desirable to analyse the linear response of the magnetization vector in a saturated magnetization state to a small electric current. In this case, the magnetization is uniform and the Dzyaloshinskii-Moriya interaction can be neglected 18 . In a simplified scenario shown in Fig.…”

Section: Current-induced Magnetization Reorientationmentioning

confidence: 99%

Quantifying interface and bulk contributions to spin–orbit torque in magnetic bilayers

et al. 2014

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Spin-orbit interaction-driven phenomena such as the spin Hall and Rashba effect in ferromagnetic/heavy metal bilayers enables efficient manipulation of the magnetization via electric current. However, the underlying mechanism for the spin-orbit interaction-driven phenomena remains unsettled. Here we develop a sensitive spin-orbit torque magnetometer based on the magneto-optic Kerr effect that measures the spin-orbit torque vectors for cobalt iron boron/platinum bilayers over a wide thickness range. We observe that the Slonczewskilike torque inversely scales with the ferromagnet thickness, and the field-like torque has a threshold effect that appears only when the ferromagnetic layer is thinner than 1 nm. Through a thickness-dependence study with an additional copper insertion layer at the interface, we conclude that the dominant mechanism for the spin-orbit interaction-driven phenomena in this system is the spin Hall effect. However, there is also a distinct interface contribution, which may be because of the Rashba effect.

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“…As is well-known, J ij is the scalar Heisenberg coupling and the energy term − e i J A ij e j = D ij ( e i × e j ) corresponds to the Dzyaloshinskii-Moriya (DM) interaction with D ij being the DM vector [16,17]. Furthermore, the magnetic anisotropy energy (MAE), defined as the energy difference between two uniformly magnetized states of the system, e i = e α and e i = e β (∀i), can be expressed as a sum of on-site and two-site anisotropies, ∆E os and ∆E ts , ∆E = E( e α ) − E( e β ) = ∆E os + ∆E ts ,…”

Section: Theory and Computational Detailsmentioning

confidence: 99%

Spin-correlations and magnetic structure in an Fe monolayer on 5dtransition metal surfaces

Simon¹,

Palotás²,

Újfalussy³

et al. 2014

J. Phys.: Condens. Matter

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Abstract. We present a detailed first principles study on the magnetic structure of an Fe monolayer on different surfaces of 5d transition metals. We use the spin-cluster expansion technique to obtain parameters of a spin model, and predict the possible magnetic ground state of the studied systems by employing the mean field approach and in certain cases by spin dynamics calculations. We point out that the number of shells considered for the isotropic exchange interactions plays a crucial role in the determination of the magnetic ground state. In the case of Ta substrate we demonstrate that the out-of-plane relaxation of the Fe monolayer causes a transition from ferromagnetic to antiferromagnetic ground state. We examine the relative magnitude of nearest neighbour Dzyaloshinskii-Moriya (D) and isotropic (J) exchange interactions in order to get insight into the nature of magnetic pattern formations. For the Fe/Os(0001) system we calculate a very large D/J ratio, correspondingly, a spin spiral ground state. We find that, mainly through the leading isotropic exchange and Dzyaloshinskii-Moriya interactions, the inward layer relaxation substantially influences the magnetic ordering of the Fe monolayer. For the Fe/Re(0001) system characterized by large antiferromagnetic interactions we also determine the chirality of the 120 • Néel-type ground state.PACS numbers: 75.10.Hk Spin-correlations and magnetic structure in an Fe monolayer on 5d transition metal surfaces2

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New Mechanism of Anisotropic Superexchange Interaction

Cited by 1,261 publications

References 7 publications

A comparison of the magnetic properties of polysaccharide iron complex (PIC) and ferritin

A comparison of the magnetic properties of polysaccharide iron complex (PIC) and ferritin

Quantifying interface and bulk contributions to spin–orbit torque in magnetic bilayers

Spin-correlations and magnetic structure in an Fe monolayer on 5dtransition metal surfaces

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