Observation of the Nonreciprocal Magnon Hanle Effect

Excitation of exchange spin waves in a magnetic insulator thin film at cryogenic temperatures

“…Compared to the electromagnetic waves at the same frequency, spin waves process the wavelength reduced by four to five orders of magnitude, which makes * Authors to whom any correspondence should be addressed. them compatible with miniaturized electric devices and nanocircuits in advanced nanotech applications [3,[8][9][10][11][12]. Dipolar spin waves, dominated by dipole-dipole interaction with the wavelength typically in the millimeter to micrometer scale, have been shown in prototypes of spin-wave devices such as interferometers [13,14], directional couplers [15], transistors [16], etc.…”

Observation of Second-Order Phase Transition in Canted Antiferromagnet α-Cu2V2O7 Using Magnetocaloric Effect

“…Neutron scattering experiments detected the existence of nonreciprocal antiferromagnetic magnons below the magnetic transition temperature and also observation of a magnon Hanle effect and nonreciprocal spin Seebeck voltages in noncentrosymmetric magnet α-Cu 2 V 2 O 7 . 20,21 Besides, the pyrochlore α-Cu 2 V 2 O 7 also exhibits the exchange-strictioninduced giant ferroelectric polarization. 22 However, a precise understanding of the nature of thermomagnetic PT in α-Cu 2 V 2 O 7 was lacking.…”

“…Among various pyrovanadate systems, the copper-based pyrovanadate α-Cu 2 V 2 O 7 exhibits a canted antiferromagnetic character due to the existence of a Dzyaloshinskii–Moriya (DM) interaction associated with noncentrosymmetric crystal structure. Neutron scattering experiments detected the existence of nonreciprocal antiferromagnetic magnons below the magnetic transition temperature and also observation of a magnon Hanle effect and nonreciprocal spin Seebeck voltages in noncentrosymmetric magnet α-Cu 2 V 2 O 7 . , Besides, the pyrochlore α-Cu 2 V 2 O 7 also exhibits the exchange-striction-induced giant ferroelectric polarization . However, a precise understanding of the nature of thermomagnetic PT in α-Cu 2 V 2 O 7 was lacking.…”