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Engineering Gilbert damping by dilute Gd doping in soft magnetic Fe thin films

DOI: 10.1063/1.4862091 DOI Help

Authors: W. Zhang (Southeast University, Nanjing) , S. Jiang (Southeast University, Nanjing) , P. K. J. Wong (MESA+ Institute for Nanotechnology) , L. Sun (Southeast University, Nanjing) , Y. K. Wang (Southeast University, Nanjing) , K. Wang (MESA+ Institute for Nanotechnology) , M. P. De Jong (MESA+ Institute for Nanotechnology) , W. G. Van Der Wiel (MESA+ Institute for Nanotechnology) , Y. Zhai (Southeast University, Nanjing) , Gerrit Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Applied Physics , VOL 115 (17) , PAGES 17A308

State: Published (Approved)
Published: May 2014

Abstract: By analyzing the ferromagnetic resonance linewidth, we show that the Gilbert damping constant in soft magnetic Fe thin films can be enhanced by ∼6 times with Gd doping of up to 20%. At the same time, the magnetic easy axis remains in the film plane while the coercivity is strongly reduced after Gd inclusion. X-ray magnetic circular dichroism measurements reveal a strong increase in the orbital-to-spin moment ratio of Fe with increasing Gd concentration, in full agreement with the increase in the Gilbert damping obtained for these thin films. Combined with x-ray diffraction and vibrating sample magnetometry, the results demonstrate that the FeGd thin films with dilute Gd doping of up to 20% are promising candidates for spin-transfer-torque applications in soft magnetic devices, in which an enhanced damping is required.

Journal Keywords: X-Ray Magnetic Circular Dichroism

Subject Areas: Physics, Materials, Energy

Facility: MAX-lab