Wang<i>et al.</i>Reply:

Wang, X. L.; Chen, Jing; Li, Y. N.; Ding, Jianping; Guo, Chao-Heng; Wang, H. T.

doi:10.1103/physrevlett.106.189302

Cited by 85 publications

(126 citation statements)

References 8 publications

Supporting

Mentioning

115

Contrasting

Order By: Relevance

“…Remarkably, the observation of EB effect under zero field cooled (ZFC) procedure, also known as spontaneous exchange bias effect, is less common. Wang et al first reported such phenomenon in Ni-Mn-In Heusler system, [16] and later on, it was also disclosed in other intermetallic systems. [21][22][23][24] This effect was explained in terms of a magnetic phase separation between superferromagnetic and AFM regions, in which the strong uniaxial anisotropy needed for EB effect can be obtained isothermally without a field cooled (FC) procedure.…”

Section: Introductionmentioning

confidence: 87%

“…[3][4][5][6][7][8][9][10] It is conventionally generated by a unidirectional exchange anisotropy when the material is cooled in a static magnetic field below the AFM transition. [10][11][12][13][14][15][16] A simultaneous but rarely observed effect is a shift of magnetic hysteresis loop along the magnetization axis, which is referred to as vertical magnetization shift (VMS). [17][18][19][20] Recently, VMS has been observed in several magnetic bilayer systems, in which VMS seems to be an effective source for the exchange bias effect.…”

Section: Introductionmentioning

confidence: 99%

“…[17,18] Since the first observation of exchange bias in Co/CoO systems, a large number of investigations have been devoted to the study of EB in nanostructures and heterostructures to develop advanced magnetic materials for practical applications and to microscopically understand it. [7][8][9][10][11][12][13][14][15][16]The vast majority of the investigated cases are heterogeneous systems characterized by magnetic phase separations at low temperature. [19,[21][22][23][24] By contrast, EB effect in single phase bulk material is less exploited.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

et al. 2019

View full text Add to dashboard Cite

Exchange bias (EB) refers to a shift of the hysteresis loop along the field axis in materials consisting of ferromagnetic (FM) and antiferromagnetic (AFM) layers, generally after a cooling procedure in high magnetic field. This effect is highly desirable for technological applications ranging from spintronics to magnetic recording. Achieving giant EB effect near room temperature in a small cooling field is thus an on-going technologically relevant challenge for the materials science community. In this work, we present the experimental realization of such a fundamental goal by demonstrating the existence of giant EB after a zero field cooled (ZFC) procedure in antiperovskite Mn 3.5 Co 0.5 N below 256 K. We found that it exhibits an EB field of −0.28 T at 50 K after a ZFC procedure accompanied by a large vertical magnetization shift (VMS). Interestingly, this EB field can be elevated up to −1.2 T after a cooling procedure with a small applied field of just 500 Oe. Mn 3.5 Co 0.5 N bears the first intermetallic material showing a strong correlation between EB and VMS. We attribute the observed EB effect to a completely new canted triangular magnetic structure determined by neutron diffraction experiment. Finally, we discuss the striking effect of Co substitution on the physical properties of antiperovskite materials and put forward a new strategy for antiperovskite lattice to exploit new single phase materials showing large EB effect at room temperature.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Linearly polarized light has been used to orient birefringent objects in conventional optical tweezers [1][2][3] and circular polarization has been used to make them rotate [1,[3][4][5][6][7]. More recently, optically isotropic objects also have been observed to circulate in circularly polarized optical traps [8][9][10], through a process described as spin-to-orbit conversion [10][11][12][13][14]. Here, we present a general formulation of the linear and angular momentum densities in vector beams of light that clarifies how the amplitude, phase and polarization profiles contribute to the forces and torques that such beams exert on illuminated objects.…”

mentioning

confidence: 99%

Optical Forces and Torques in Nonuniform Beams of Light

2012

View full text Add to dashboard Cite

The spin angular momentum in an elliptically polarized beam of light plays several noteworthy roles in optical traps. It contributes to the linear momentum density in a non-uniform beam, and thus to the radiation pressure exerted on illuminated objects. It can be converted into orbital angular momentum, and thus can exert torques even on optically isotropic objects. Its curl, moreover, contributes to both forces and torques without spin-to-orbit conversion. We demonstrate these effects experimentally by tracking colloidal spheres diffusing in elliptically polarized optical tweezers. Clusters of spheres circulate determinisitically about the beam's axis. A single sphere, by contrast, undergoes stochastic Brownian vortex circulation that maps out the optical force field.Optical forces arising from the polarization and polarization gradients in vector beams of light constitute a new frontier for optical micromanipulation. Linearly polarized light has been used to orient birefringent objects in conventional optical tweezers [1][2][3] and circular polarization has been used to make them rotate [1,[3][4][5][6][7]. More recently, optically isotropic objects also have been observed to circulate in circularly polarized optical traps [8][9][10], through a process described as spin-to-orbit conversion [10][11][12][13][14]. Here, we present a general formulation of the linear and angular momentum densities in vector beams of light that clarifies how the amplitude, phase and polarization profiles contribute to the forces and torques that such beams exert on illuminated objects. This formulation reveals that the curl of the spin angular momentum can exert torques on illuminated objects without contributing to the light's orbital angular momentum, and that this effect dominates spin-to-orbit conversion in circularly polarized optical tweezers. Predicted properties of polarization-dependent optical forces are confirmed through observations of a previously unreported mode of Brownian vortex circulation for an isotropic sphere in elliptically polarized optical tweezers.The vector potential describing a beam of light of angular frequency ω may be written aswhere u(r) is the real-valued amplitude, ϕ(r) is the realvalued phase andǫ(r) is the complex-valued polarization vector at position r. This description is useful for practical applications because u(r), ϕ(r) andǫ(r) may be specified independently, for example using holographic techniques [3,[15][16][17]]. Poynting's theorem then yields the time-averaged momentum densitywhere µ is the permeability of the medium and c is the speed of light in the medium. The momentum density gives rise to the radiation pressure that the light exerts on illuminated objects and may be expressed in terms of the experimentally accessible parameters aswhere I(r) = u 2 (r) is the intensity and whereis the spin angular momentum density in a beam of light with local helicityThe projection of σ(r) onto the propagation direction k(r) is related to the Stokes parameters of the beam [18] by σ(r) ·k(r) = S 3 (...

show abstract

“…Besides the known hcp and bcc phases, we find a close-packed R3m phase with competitive energy compared to the hcp phase in the pressure range of 350-380 GPa. Further kinetic barrier was simulated using the climbing image nudged elastic band (CINEB) method [19][20][21][22][23]. The energetics and kinetics both suggest the coexistence of hcp phase and R3m phase in the pressure range of 300-380 GPa.…”

mentioning

confidence: 99%

Novel R3¯m phase of beryllium under high pressure

Qiu

et al. 2015

Physics Letters A

View full text Add to dashboard Cite

Wanget al.Reply:

Cited by 85 publications

References 8 publications

Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

Optical Forces and Torques in Nonuniform Beams of Light

Novel R3¯m phase of beryllium under high pressure

Contact Info

Product

Resources

About