Magnetic Hyperfine Fields at Se Adatoms on Ni Surfaces.

نویسندگان

  • Granzer
  • Bertschat
  • Haas
  • Zeitz
  • Lohmüller
  • Schatz
چکیده

Magnetic hyperfine fields for Se on Ni(111) and Ni(001) surfaces were measured with the perturbed angular correlation technique. The results are jBhfj ­ 2.7s3d T for Se on Ni(111) and jBhfj ­ 0.8s3d T for Se on Ni(001) at 90 K. These values of magnetic hyperfine fields of an adatom deviate drastically from the known bulk value of Bhf ­ 15 T. The surface site positions of the probe atoms are discussed with the aid of the results for the electric hyperfine interactions measured simultaneously. [S0031-9007(96)01654-7]

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Coordination-number dependence of magnetic hyperfine fields at (111)Cd on Ni surfaces.

Ferromagnetic Ni surfaces were investigated on an atomic scale using the perturbed angular correlation spectroscopy probe (111)Cd. A comprehensive set of data for magnetic hyperfine fields (B(hf)) at various probe sites is presented. A field variation from -7 T in Ni bulk to the surprisingly large value of 16 T at the adatom position on Ni(111) is observed. A continuous nonlinear dependence is ...

متن کامل

Complex magnetic structure of clusters and chains of Ni and Fe on Pt(111)

We present an approach to control the magnetic structure of adatoms adsorbed on a substrate having a high magnetic susceptibility. Using finite Ni-Pt and Fe-Pt nanowires and nanostructures on Pt(111) surfaces, our ab initio results show that it is possible to tune the exchange interaction and magnetic configuration of magnetic adatoms (Fe or Ni) by introducing different numbers of Pt atoms to l...

متن کامل

Absence of magnetism in hcp iron-nickel at 11 K.

Synchrotron Mössbauer spectroscopy (SMS) was performed on an hcp-phase alloy of composition Fe92Ni8 at a pressure of 21 GPa and a temperature of 11 K. Density functional theoretical calculations predict antiferromagnetism in both hcp Fe and hcp Fe-Ni. For hcp Fe, these calculations predict no hyperfine magnetic field, consistent with previous experiments. For hcp Fe-Ni, however, substantial hyp...

متن کامل

Nuclear Gamma Resonance Study of Alloy Systems

The Ir-Fe and Ir-Ni alloy systems were studied over the whole composition range by means of the nuclear resonance absorption of the 73 keV y-rays of 193Jr and of the 14.4 keV y-rays of 57Fe. The magnetic hyperfine field at the Ir-nuclei in Ir-Ni alloys decreases approximately linearly with the Ir concentration from — 460 kOe at 4.2 K in very dilute alloys to zero at about 20 at.-% Ir. This beha...

متن کامل

SURFACE MAGNETISM OF THE CLEAN Ni (111) SURFACE AND OF A Ni MONOLAYER ON Cu (111)

Results of highly precise all-electron local spin density FLAPW calculations on (i) a close-packed 7-layer Ni (111) slab and (ii) a p (1 x 1) Ni monolayer on Cu (111) are presented. For Ni ( I l l ) , we find an enhancement of the magnetic moment for both the surface (to 0.63 pB) and sub-surface Ni layers (from a center layer value of 0.58 pB). In contrast, a slight decrease of the magnetic hyp...

متن کامل

ذخیره در منابع من

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 77 20  شماره 

صفحات  -

تاریخ انتشار 1996