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We consider the magnetic-field dependent spatial magnetization pattern arounda general impurity embedded in a Heisenberg antiferromagnet using both ananalytical and a numerical spin wave approach. The results are compared toquantum Monte Carlo simulations. The decay of the magnetization pattern awayfrom the impurity follows a universal form which reflects the properties of thepure antiferromagnetic Heisenberg model. Only the overall magnitude of theinduced magnetization depends also on the size of the impurity spin and theimpurity coupling.

Spin wave calculation of the field-dependent magnetization pattern around an impurity in Heisenberg antiferromagnets