Ultrafast magnetization dynamics in an epitaxial Ni54.3Mn31.9Sn13.8 Heusler-alloy film close to the Curie temperature

被引：14

作者：

Bonda, A. ^{[1
]}

Uba, L. ^{[1
]}

Zaleski, K. ^{[2
]}

Uba, S. ^{[1
]}

机构：

[1] Univ Bialystok, Fac Math & Informat, K Ciolkowskiego 1M, PL-15245 Bialystok, Poland

[2] AMU, NanoBioMed Ctr, Wszechnicy Piastowskiej 3, PL-61614 Poznan, Poland

来源：

PHYSICAL REVIEW B | 2019年 / 99卷 / 18期

关键词：

MAGNETOCALORIC PROPERTIES; CRITICAL-BEHAVIOR; SPIN DYNAMICS; NI; ALLOYS;

D O I：

10.1103/PhysRevB.99.184424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of the amplitude of an external magnetic field (H) and femtosecond laser pulse fluence (F) on ultrafast magnetization dynamics has been investigated in a ferromagnetic Ni54.3Mn31.9Sn13.8 Heusler-alloy film using the time-resolved magneto-optical Kerr effect. A large slowing down of the demagnetization process was observed and characteristic parameters of magnetization precession were determined for a wide range of H and F values. Long demagnetization times of the order of hundreds of picoseconds have been found and explained as a result of the Curie temperature (T-C) proximity in the alloy film studied. Effective magnetic anisotropy field (H-k(eff)) and Gilbert damping parameter dependencies were determined. A significant reduction of the precession frequency versus F of the uniform Kittel mode was found. A strong decrease of H-k(eff) with F was well simulated in the frame of an extended version of the microscopic three-temperature model (eM3TM), and explained by the T-C proximity effect. The estimated low values of the eM3TM model parameters, the demagnetization rate and electron-lattice coupling constant, appeared essential to explain the slowing down effect of demagnetization. Precession amplitude dependencies were explained by a phenomenological approach taking into account H-k(eff) and changes of the equilibrium magnetization angles induced by pump-pulse excitation.

引用

页数：11

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