Monitoring laser-induced magnetization in FeRh by transient terahertz emission spectroscopy | Zendy

Nilesh Awari | Zendy; Anna Semisalova | Zendy; JanChristoph Deinert | Zendy; K. Lenz | Zendy; J. Lindner | Zendy; Eric E. Fullerton | Zendy; Vojtěch Uhlíř | Zendy; Jingtao Li | Zendy; B. M. Clemens | Zendy; Robert Carley | Zendy; A. Scherz | Zendy; Sergey Kovalev | Zendy; Michael Gensch | Zendy

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Monitoring laser-induced magnetization in FeRh by transient terahertz emission spectroscopy

Author(s) -

Nilesh Awari,

Anna Semisalova,

JanChristoph Deinert,

K. Lenz,

J. Lindner,

Eric E. Fullerton,

Vojtěch Uhlíř,

Jingtao Li,

B. M. Clemens,

Robert Carley,

A. Scherz,

Sergey Kovalev,

Michael Gensch

Publication year - 2020

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/5.0019663

Subject(s) - terahertz radiation , magnetization , materials science , magnetometer , picosecond , kerr effect , magnetization dynamics , laser , magnetic circular dichroism , excited state , ferromagnetism , spectroscopy , condensed matter physics , magneto optic kerr effect , antiferromagnetism , optics , optoelectronics , atomic physics , physics , magnetic field , spectral line , quantum mechanics , astronomy , nonlinear system

In this study, a conceptually different approach for investigating magnetic phase transitions in ultra-thin films is presented. THz emission from a laser-excited material is used to monitor the magnetization dynamics during the laser-driven antiferromagnetic to ferromagnetic transition in FeRh. The emitted THz signal is calibrated against static magnetometry data measurements, giving a direct measure of the absolute magnetic moment of the sample on the sub-picosecond timescale. The technique is, therefore, highly complementary to conventional time-resolved experiments such as time resolved magneto-optic Kerr effect (MOKE) or x-ray magnetic circular dichroism.

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